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【334341】2024年普通高等学校招生全国统一考试北京卷数学

时间:2025-01-21 18:04:21 作者: 字数:14199字
简介:

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学校: 姓名: 班级: 考号:



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绝密★启用前

153722-2024年普通高等学校招生全国统一考试(北京卷)数学-网络收集版


学校:___________姓名:___________班级:___________考号:___________


题号

总分

得分






注意事项:

1.答题前填写好自己的姓名、班级、考号等信息

2.请将答案正确填写在答题卡上


一、选择题:共10小题,每小题4分,共40.在每小题列出的四个选项中,选出符合题目要求的一项.

1.已知集合  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> (      )

A  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> B  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

C  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> D  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

2.已知  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> (      ).

A  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> B  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> C  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> D1

3.求圆  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的圆心到  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的距离(      )

A  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> B2C  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> D  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

4  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的二项展开式中  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的系数为(      )

A15B6C  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> D  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

5.已知向量  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 则“  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ”是“  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ”的(      )条件.

A.必要而不充分条件B.充分而不必要条件

C.充分且必要条件D.既不充分也不必要条件

6.已知  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> π <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> (      )

A1B2C3D4

7.记水的质量为  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 并且  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 越大,水质量越好.若  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 不变,且  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>   <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的关系为(      )

A  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

B  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

C.若 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ;若 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

D.若 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ;若 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

8.已知以边长为4的正方形为底面的四棱锥,四条侧棱分别为 ,,, <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 则该四棱锥的高为(      )

A  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> B  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> C  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> D  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

9.已知  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 是函数  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 图象上不同的两点,则下列正确的是(      )

A  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

B  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

C  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

D  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

10.若集合  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 表示的图形中,两点间最大距离为  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 、面积为  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ,则(      )

A <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> B <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

C <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> D <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

二、填空题:共5小题,每小题5分,共25.

11.已知抛物线  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 则焦点坐标为        

12.已知 ππ <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的终边关于原点对称,则  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的最大值为        

13.已知双曲线  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 则过  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 且和双曲线只有一个交点的直线的斜率为        

14.已知三个圆柱的体积为公比为10的等比数列.第一个圆柱的直径为65mm,第二、三个圆柱的直径为325mm,第三个圆柱的高为230mm,求前两个圆柱的高度分别为        

15.已知  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 不为常数列且各项均不相同,下列正确的是      .

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 均为等差数列,则  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 中最多一个元素;

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 均为等比数列,则  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 中最多三个元素;

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 为等差数列  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 为等比数列,则  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 中最多三个元素;

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 单调递增  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 单调递减,则  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 中最多一个元素.

三、解答题:共6小题,共85.解答应写出文字说明,演算步骤或证明过程.

16.在  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 中,  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 为钝角,  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

(1)  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ;

(2)从条件、条件和条件这三个条件中选择一个作为已知,求  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的面积.

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

注:如果选择条件、条件和条件分别解答,按第一个解答计分.

17.已知四棱锥  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 上一点,  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

(1)  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 中点,证明:  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 平面  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

(2)  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 平面  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ,求面  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 与面  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 夹角的余弦值.

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

18.已知某险种的保费为0.4万元,前3次出险每次赔付0.8万元,第4次赔付0.6万元,

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

在总体中抽样100单,以频率估计概率:

(1)求随机抽取一单,赔偿不少于2次的概率;

(2)(i)毛利润是保费与赔偿金额之差.设毛利润为  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ,估计  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的数学期望;

(ii)若未赔偿过的保单下一保险期的保费下降  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ,已赔偿过的增加  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .估计保单下一保险期毛利润的数学期望.

19.已知椭圆方程  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ,焦点和短轴端点构成边长为2的正方形,过  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的直线  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 与椭圆交于  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ,连接  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 交椭圆于  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

(1)求椭圆方程和离心率;

(2)若直线  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的斜率为0,求  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

20.已知  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 处切线为  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

(1)若切线  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的斜率  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ,  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 单调区间;

(2)证明:切线  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 不经过  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

(3)已知  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ,其中  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ,切线  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 轴交于点  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .则当  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ,符合条件的  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的个数为?

(参考数据:  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

21.设集合  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

对于给定有穷数列  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 和序列  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 定义变换  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 将数列  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的第  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 列加1,得到数列  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ;将数列  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的第  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 列加1,得到数列  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ;重复上述操作,得到数列  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 记为  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

(3)  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 为偶数,证明:“  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 为常数列”的充要条件为“  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ”.

参考答案

一、选择题:共10小题,每小题4分,共40.在每小题列出的四个选项中,选出符合题目要求的一项.

1. A

意得  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

A.


2. C

意得  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

C.


3. C

意得  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

心坐标为  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 则圆心到直线  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的距离  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

C.


4. B

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的二展开式  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 解得  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

故所求即  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

B.


5. A

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 可得  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

可知  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 等价于  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 可得  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 可知必要性成立;

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 无法得出  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

例如  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 可知充分性不成立;

上所述,  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的必要不充分条件.

A.


6. B

意可知:  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的最小  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的最大点,

π <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> π <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 所以 π <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

B.


7. C

意可得  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 解得  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 可得  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 可得  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 可得  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

选项可知C正确  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 错误

C.


8. D

,底面  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 正方形,

当相的棱相等,不妨  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的中点  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 平面  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

可知  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 平面  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 平面  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

所以平面  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 平面  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的垂线,垂足  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

由平面  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 平面  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 平面  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

所以  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 平面  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

意可得:  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 可得  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

所以四棱的高  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

当相的棱相等,不妨  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 不能形成三角形  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 意不符,这样情况不存在.

D.


9. A

意不妨  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 函数  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 是增函数,所以  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

选项AB:可得  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

根据函数  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 是增函数,所以  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> A正确  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 错误

选项C:例如  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

可得  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> C错误

选项D:例如  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

可得  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> D错误

A.


10. C

任意  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

可知  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的任意性,所以所求集合表示的形即平面区域  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

阴影部分所示,其中  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

可知任意两点距离最大  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

阴影部分面  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

C.


二、填空题:共5小题,每小题5分,共25.

11.  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

意抛物线准方程  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 所以其焦点坐标为  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

故答案  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .


12.  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> /  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

ππ <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 从而 ππ <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

ππ <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 所以  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的取  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的取  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

当且 π <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ππ <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 取得最大,且最大值为  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

故答案  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .


13.  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 解得  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 表明意的直线斜率一定存在,

所求直线斜率  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 则过  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 且斜率  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的直线方程  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 并整理得:  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

意得  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

解得  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 或无解,即  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 经检验,符合.

故答案  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .


14.  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

第一个柱的高  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 第二个柱的高  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ππππ <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

故答案  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .


15. ①③④

,因  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 等差数列,故它的散点分布在直线上,

而两条直线至多有一个公共点,故  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 中至多一个元素,故正确.

,取  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 等比数列,

但当  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 偶数,有  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 中有无多个元素,

错误.

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 中至少四个元素,关于  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的方程  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 至少有4个不同的正数解,

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的散点可得关于  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的方程  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 至多有两个不同的解,矛盾;

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 关于  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的方程  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 奇数解的个数和偶数解的个数,

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 有偶数解,此方程即  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

方程至多有两个偶数解,且有两个偶数解  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 单调性相反,

方程  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 至多一个偶数解,

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 有奇数解,此方程即  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

方程至多有两个奇数解,且有两个奇数解  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 单调性相反,

方程  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 至多一个奇数解,

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 不可能同成立,

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 不可能有4个不同的正数解,故正确.

,因  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 为单调递  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 为递减数列,前者散点呈上升趋势

后者的散点呈下降趋势,两者至多一个交点,故正确.

故答案①③④


三、解答题:共6小题,共85.解答应写出文字说明,演算步骤或证明过程.

16. 1π <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ;(2  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

1  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ,  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ,  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ππ <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

(2)不可能.

②∵  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

构成三角形.

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

③∵ ,,, <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

π <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>


17. 1)见详解;(2  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

(1)明:  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ,

ABCD平行四形.

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 交于点G  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ,

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的中位线.

BGE中点,BF  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 中位线

BFPGGCD上,PG平面  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> BF平面  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

(2)AB平面PED,  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 相互垂直,如建系,

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

,,,,,, <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .


18. 1  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ;(2)(i  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 万元;(ii0.1252万元

1  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

2)(i  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 万元.

ii)保  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> =0.4032

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 万元.


19. 1  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ;(2  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

(1)  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

(2)  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .


20. 见详解

1  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> x-1),

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 单调递减,在 () <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 单调递.

2  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 代入 (), <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

,, <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

() <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .法:假l  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> , () <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> () <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 存在零点.

()()() <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> (0+∞)单调递增,  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> () <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 无零点,  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 与假予盾,故l  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

3  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> l  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 交点B  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .,

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

t0,若  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ,  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 必有交点,与切线矛盾.

由(2)知  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ,所以  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ,  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ,  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> , (>) <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

足条件的  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 几个即  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 有几个零点.

() <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 单调递减,  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 单调递调,在  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 单调递.

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> ,所以由零点定理及  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 单调性,  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 上必有一个零点,(4999)上必有一个零点.

上所述,  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 有两个零点,即  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 有两个.

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>


21. 见详解

1)由意得  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

2)假存在符合条件的  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 可知  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的第  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 之和  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 之和  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 方程无解,故假不成立,

故不存在符合条件的  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>

3)我们设序列  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 别规  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

必要性:

若存在序列  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 使得  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 常数列.

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 所以  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

根据  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的定然有  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

所以不断使用式就得到 ,, <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 必要性得.

充分性:

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

由已知  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 偶数,而  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 所以  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 也是偶数.

们设  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 是通合法的序列  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 变换能得到的所有可能的数列  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 中,使得  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 最小的一个.

上面已经证  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

从而由  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 可得  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

,由于  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 是偶数,所以  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的奇偶性保持不,从而  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 都是偶数.

下面明不存在  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 使得  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

存在,根据称性,不妨  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

情况1:若  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 都是偶数,知  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

对该数列连续作四次变换  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 后,新的  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 相比原来的  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 减少  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的最小性矛盾;

情况2:若  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 不妨  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

情况2-1:如果  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 则对该数列连续作两次变换  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 后,新的  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 相比原来的  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 至少减少  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的最小性矛盾;

情况2-2:如果  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 则对该数列连续作两次变换  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 后,新的  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 相比原来的  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 至少减少  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的最小性矛盾.

明无如何都会致矛盾,所以任意的  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 都有  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

存在  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 使得  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 是奇数,所以  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 都是奇数,设为  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

时对任意  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 可知必有  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> .

 <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 都是偶数,故集合  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 中的四个元素  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 之和偶数,对该数列行一次变换  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 则该数列成常数列,新的  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 等于零,比原来的  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 更小,  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 的最小性矛盾.

上,只可能  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a>  <a href="/tags/37/" title="普通" class="c1" target="_blank">普通</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/56/" title="北京" class="c1" target="_blank">北京</a> <a href="/tags/261/" title="考试" class="c1" target="_blank">考试</a> <a href="/tags/491/" title="学校" class="c1" target="_blank">学校</a> <a href="/tags/881/" title="统一" class="c1" target="_blank">统一</a> 是常数列,充分性得.