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【327981】福建省2021年中考数学试卷

时间:2025-01-20 20:54:44 作者: 字数:18336字
简介:

绝密·启用前

福建省2021年中考数学试卷

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



评卷人

得分




一、选择题

1.在实数 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 0 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 中,最小的数是( )
A
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
B
0
C
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
D
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

2.如图所示的六角螺栓,其俯视图是( )
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
A
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
B
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
C
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
D
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

3.如图,某研究性学习小组为测量学校A与河岸工厂B的距离,在学校附近一点C,利用 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> .据此,可求得学校与工厂之的距离 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 等于(
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
A
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
B
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
C
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
D
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

4.下列运算正确的是( )
A
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
B
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
C
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
D
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

5.某校为推荐一项作品参加“科技创新”比赛,对甲、乙、丙、丁四项候选作品进行量化评分,具体成绩(百分制)如表:

项目


作品

创新性

90

95

90

90

实用性

90

90

95

85


如果按照创新性占60%,实用性占40%计算总成绩,并根据总成绩择优推荐,那么应推荐的作品是( )
A
.甲
B
.乙
C
.丙
D
.丁

6.某市2018年底森林覆盖率为63%.为贯彻落实“绿水青山就是金山银山”的发展理念,该市大力开展植树造林活动,2020年底森林覆盖率达到68%,如果这两年森林覆盖率的年平均增长率为x,那么,符合意的方程是(
A
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
B
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
C
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
D
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

7.如图,点F在正五 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的内部, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 三角形, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 等于(
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
A
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
B
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
C
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
D
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

8.如图,一次函数 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的图象过点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,则不等式 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的解集是( )
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
A
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
B
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
C
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
D
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

9.如图, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的直径,点P <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的延长线上, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 相切,切点分别为CD.若 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 等于(
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

A
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
B
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
C
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
D
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

10.二次函数 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的图象过 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 四个点,下列说法一定正确的是( )
A
.若 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,则 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
B
.若 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,则 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
C
.若 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,则 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
D
.若 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,则 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

评卷人

得分




二、填空题

11.若反比例函数 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的图象过点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,则k等于_________

12.写出一个无理数x,使得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> x可以是_________(只要写出一个足条件的x即可)

13.某校共有1000名学生.为了解学生的中长跑成绩分布情况,随机抽取100名学生的中长跑成绩,画出条形统计图,如图.根据所学的统计知识可估计该校中长跑成绩优秀的学生人数是_________
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

14.如图, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的角平分线.若 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,则点D <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的距离是_________
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

15.已知非零实数xy <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 等于_________

16.如图,在矩形 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 中, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,点EF <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 上的点,点E不与AB重合,且 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> G是五 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的点.现给出以下结论
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 一定互
G <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的距离一定相等;
G <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的距离可能相等;
G <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的距离的最大值为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
其中正确的是_________.(写出所有正确结论的序号)
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

评卷人

得分




三、解答题

17.计算: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

18.如图,在 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 中,D <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 上的点, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,垂足分别为EF,且 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> .求 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

19.解不等式组: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

20.某公司经营某种农产品,零售一箱该农产品的利润是70元,批发一箱该农产品的利润是40元.
1)已知该公司某月卖出100箱这种农产品共获利润4600元,问:该公司当月零售、批发这种农产品的箱数分别是多少?
2)经营性质规定,该公司零售的数量不能多于总数量的30%.现该公司要经营1000箱这种农产品,问:应如何规划零售和批发的数量,才能使总利润最大?最大总利润是多少?

21.如图,在 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 中, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> .线段 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 是由线段 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 平移得到的,点F <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 上, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 是以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的等腰直角三角形,且点D恰好在 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的延长线上.
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
1)求 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
2)求 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

22.如图,已知线段 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,垂足为a
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
1)求作四 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,使得点BD在射线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 上,且 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ;(要求:尺,不写作法,保留作痕迹)
2PQ别为1)中四 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的中点,求:直线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 相交于同一点.

23.田忌赛马”的故事闪烁着我国古代先贤的智慧光芒.该故事的大意是:齐王有上、中、下三匹马 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,田忌也有上、中、下三匹马 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,且这六匹马在比赛中的胜负可用不等式表示如下: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> (注: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 表示ABA马获胜).一天,王找田忌赛马定:每匹都出一局,共三局,两局者得整利.面,田忌事先了解到王三局比、中、下,并采用孙膑的策略:分用下、上、中王的上、中、下,即借助对阵 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 得了整利,造了以弱胜强典案例.
设齐王事先不打探田忌的情况,回答以下问题
1)如果田忌事先只打探到王首局将出,他首局出哪种才可能得整利?并求其获胜的概率;
2)如果田忌事先无法打探到王各局的情况,他是否必无疑?若是,请说明理由;若不是,列出田忌得整赛胜利的所有对阵情况,并求其获胜的概率.

24.如图,在正方形 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 中,EF为边 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 上的两个三等分点,点A关于 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 称点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的延长线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 于点G
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
1)求 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
2)求 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的大小;
3)求 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

25.已知抛物线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> x只有一个公共点.
1)若抛物线过 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,求 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的最小
2)已知点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 中恰有两点在抛物线上.
求抛物线的解析式;
线l <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 与抛物线交于MN两点,点A在直线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 上,且 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> A且与x垂直的直线交抛物线和于点BC.求 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的面相等.

参考答案

1.A

【解析】
根据正数大于00大于负数,两个负数,绝对值大的反而小.
解:在实数 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 0 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 中,
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 为正数大于0
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 为负数小于0
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 最小的数是: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
故选:A

2.A

【解析】
根据从上面看到的图形即可得到答案.
从上面看是一个正六边形,中间是一个圆,
故选:A

3.D

【解析】
解直角三角形,已知一条直角边和一个锐角,求斜边的长.
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
故选D

4.D

【解析】
根据不同的运算法则或公式逐项加以计算,即可选出正确答案.
解:A <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,故 A错误;
B
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,故 B错误;
C
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,故C错误;
D
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
故选:D

5.B

【解析】
利用加权平均数计算总成绩,比较判断即可
根据题意,:
甲:90×60%+90×40%=90
乙:95×60%+90×40%=93
丙:90×60%+95×40%=92
丁:90×60%+85×40%=88
故选B

6.B

【解析】
年平均增长率为x,根据2020年底森林覆盖率2018年底森林覆盖率乘 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,据此即可列方程求解.
解:设年平均增x,由题意得:
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
故选:B

7.C

【解析】
根据多边形内角和公式可求出∠ABC的度数,根据正五形的性可得AB=BC,根据等三角形的性可得ABF=AFB=60°AB=BF,可得BF=BC,根据角的和差关系可得出FBC的度数,根据等腰三角形的性可求出BFC的度数,根据角的和差关系即可得答案.
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 是正五形,
∴∠ABC= <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> =108°AB=BC
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 三角形,
∴∠ABF=AFB=60°AB=BF
BF=BCFBC=ABC-ABF=48°
∴∠BFC= <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> =66°
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> =AFB+BFC=126°
C

8.C

【解析】
先平移该一次函数图像,得到一次函数 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的图像,再由图像即可以判断出  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的解集.
解:如图所示,将直线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 向右平移1个单位得到  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,该图像经过原点,
由图像可知,在y轴右侧,直线位于x轴上方,即y0
因此,当x0时, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
故选:C
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

9.D

【解析】
连接OCCPDPO的切线,根据定理可知∠OCP90°,∠CAP=∠PAD,利用三角形的一个外角等于与其不相邻的两个内角的和可求∠CAD=COP,在RtOCP中求出 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 即可
解:连接OC
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

CP
DPO的切线,则∠OCP90°,∠CAP=∠PAD
∴∠
CAD=2CAP
OA=OC
∴∠OAC=∠ACO
∴∠
COP2CAO
∴∠COP=∠CAD
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
OC=3
RtCOP中,OC=3PC=4
OP=5
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> = <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> = <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
故选:D

10.C

【解析】
求出抛物线的对称轴,根据抛物线的开口方向和增减性,根据横坐标的值,可判断出各点纵坐标值的大小关系,从而可以求解.
解: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 二次函数 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的对称轴为:
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,且开口向上,
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 距离对称轴越近,函数值越小,
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
A
,若 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,则 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 不一定成立,故选项错误,不符合题意;
B,
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,则 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 不一定成立,故选项错误,不符合题意;
C
,若 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,所以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,则 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 一定成立,故选项正确,符合题意;
D
,若 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,则 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 不一定成立,故选项错误,不符合题意;
故选:C

11.1

【解析】
结合题意,将点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 代入到 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,通过计算即可得到答案.
反比例函数 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的图象过点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,即 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
故答案为:1

12.答案不唯一(如 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 等)

【解析】
从无理数的三种形式:①开方开不尽的数,②无限不循环小数,③含有π的数,
根据无理数的定义写一个无理数,满足 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 即可;
所以可以写:
开方开不尽的数: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
无限不循环小数, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
含有π的数 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 等.只要写出一个满足条件的x即可.
故答案:答案不唯一(如 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 等)

13. <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

【解析】
利用样本中的优秀率来估计整体中的优秀率,从而得出总体中的中长跑成绩优秀的学生人数.
解:由图知:样本中优秀学生的比例为: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 该校中长跑成绩优秀的学生人数是: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> (人)
故答案是: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

14. <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

【解析】
根据角平分线的性质,角平分线上的点到角的两边的距离相等,即可求得.
如图,过D <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> D <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的距离DE
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 平分 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> D <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的距离 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
故答案 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

15.4

【解析】
由条件 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 变形得,x-y=xy,把此式代入所求式子中,化即可求得其
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 得:xy+y=x,即x-y=xy
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
故答案4

16.①②④

【解析】
利用四边形内角和为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 即可求证;
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,证明 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 即可得结论;
分别求出G <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的距离的范,再行判断;
G <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的距离的最大值为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> GE所求.
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 是矩形
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,形内角和 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 正确.
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
即点G <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的距离一定相等
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 正确.
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
所以点G <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的距离不可能相等
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 不正确.

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,点G <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的距离的最大
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 正确.
上所述:①②④正确.
故答案①②④

17. <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

【解析】
先化简二次根式,绝对值,负整式指数幂,然后计算即可得答案.
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

18.见解析

【解析】
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 得出 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,由SAS证明 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,得出对应角相等即可.
明: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 中, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

19. <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

【解析】
分别求出不等式组中各不等式的解集,再取公共部分即可.
解:解不等式 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
解得: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
解不等式 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
解得: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
所以原不等式组的解集是: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

20.1)该公司当月零售农产品20箱,批发农产品80箱;(2)该公司应零售农产品300箱、批发农产品700箱才能使总利润最大,最大总利润是49000

【解析】
1设该公司当月零售农产品x箱,批发农产y,利用100农产品共4600列方程组,然后解方程组即可;
2设该公司零售农产m箱,w,利用利润的意义得到 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,再根据公司零售的数量不能多于数量的30%可确定m的范围,然后根据一次函数的性质解决问题.
解:(1设该公司当月零售农产x箱,批发农产y箱.
意,得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
解得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
所以公司当月零售农产20箱,批发农产80箱.
2设该公司零售农产m箱,w元.发农产品的数量 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 箱,
公司零售的数量不能多于数量的30%
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
意,得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,所以w随着m的增大而增大,
所以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,取得最大49000元,
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
所以公司零售农产300箱、批发农产700箱才能使最大,最大49000元.

21.1)见解析;(2)见解析

【解析】
1)通过两角和等于 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,然后通过等量代换即可证明;
2)通过平移的性质,证明三角形全等,得到对应边相等,通过等量代换即可证明.
证明:(1)在等腰直角三角形 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 中, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
2)连接 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
由平移的性质得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 是等腰直角三角形,
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
由(1)得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,∴ <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

22.1)作图见解析;(2)证明见解析

【解析】
1)根据 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,点B在射线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 上,A <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ;根据等三角形性,得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,分别过AB <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 半径画弧,交点即C;再根据等三角形的性CD,即可得到答案;
2线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 相交于点S、直线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 相交于点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,根据平行线和相似三角形的性,得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,从而得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,即可完成明.
1)作如下:
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 是所求作的四形;
2线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 相交于点S
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 相交于点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
同理 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
PQ别为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的中点,
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
S <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 重合,即三条直线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 相交于同一点.

23.1)田忌首局应出“下马”才可能在整场比赛中获胜, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ;(2)不是,田忌获胜的所有对阵是 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

【解析】
1)通过理解题意分析得出结论,通过列举法求出获胜的概率;
2)通过列举齐王的出马顺序和田忌获胜的对阵,求出概率.
1)田忌首局应出“下马”才可能在整场比赛中获胜.
此时,比赛的所有可能对阵为:
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,共四种.
其中田忌获胜的对阵有
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,共两种,
故此时田忌获胜的概率为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
2)不是.
齐王的出马顺序为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 时,田忌获胜的对阵是 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
齐王的出马顺序为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 时,田忌获胜的对阵是 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
齐王的出马顺序为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 时,田忌获胜的对阵是 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
齐王的出马顺序为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 时,田忌获胜的对阵是 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
齐王的出马顺序为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 时,田忌获胜的对阵是 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
齐王的出马顺序为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 时,田忌获胜的对阵是 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
综上所述,田忌获胜的所有对阵是
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
齐王的出马顺序为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 时,比赛的所有可能对阵是
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
6种,同理,齐王的其他各种出马顺序,也都分别有相应的6种可能对阵,
所以,此时田忌获胜的概率 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

24.1)见解析;(245°;(3)见解析

【解析】
1)设直线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 相交于点T <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的中位线即可;
2 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,取 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的中点O <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 明点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> FBG四点共即可;
3 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,根据勾股定理找到ka的关系,根据 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 列比例求解即可.
解:(1线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 相交于点T
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

A <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 关于 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 称,
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 垂直平分 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,即 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
EF <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 上的两个三等分点,
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的中位线
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,即 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
2 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 是正方形,
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,又 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 是等腰直角三角形,
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的中点O <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 中,
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> FBG都在以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 直径的 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 上,
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

3 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
由(2)得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,即 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,在 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 中,由勾股定理,得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 中,由勾股定理,得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
由(2)知, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>

25.1-1;(2)① <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ;②见解析

【解析】
1)先求得c=1,根据抛物线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> x只有一个公共点,=0,从而构造二次函数求解即可;
2根据抛物线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> x只有一个公共点,得抛物线上的点只能落在x的同,据此判断即可;AB=BC即可
解:因抛物线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> x只有一个公共点,
以方程 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 有两个相等的数根,
所以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,即 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
1)因抛物线过 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,所以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
所以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,即 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
所以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 取到最小 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
2抛物线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> x只有一个公共点,
所以抛物线上的点只能落在x的同
又点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 中恰有两点在抛物线象上,
所以只能是 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 在抛物线象上,
称性可得抛物线轴为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,所以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,因 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,所以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
又点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 在抛物线象上,所以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
故抛物线的解析式 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> m,分别过MN <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,垂足分别为EF
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,所以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,所以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,所以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
所以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,所以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,即 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
所以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 代入 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
解得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
所以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
代入,得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,解得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,即 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
所以A且与x垂直的直线为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 代入 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,即 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 代入 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
所以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> ,因此 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>
所以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/891/" title="福建省" class="c1" target="_blank">福建省</a> <a href="/tags/751/" title="福建" class="c1" target="_blank">福建</a> 的面相等.