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【330451】初中数学青岛八下第9章测试卷

时间:2025-02-09 11:18:53 作者: 字数:6784字

单元测试卷

一、选择题

1.二次根式 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 有意义,则x的取值范围是

A. x2 B. x2 C. x≥2 D. x≤2

2.下列二次根式中,属于最简二次根式的是( )

A. <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> B. <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> C. <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> D. <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

3.若 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> , <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 的取值范围是

A.  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> B.  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> C.  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 0 D.  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

4.下列计算正确的是( )

A <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>B <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

C <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>D <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> .

5.二次根式 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 中,最简二次根式有( )

A1 B2 C3 D4

6.下列各式中能与 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 合并的是(

A <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> B <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> C <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> D <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

7.若 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ,则 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 的值为( )

A-1 B1 C5 D6

8.计算 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ÷ <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> × <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 结果为(

A3 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> B4 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> C5 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> D6 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

9.在下列各数:3.1415926 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>0.2 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ;中,无理数的个数( ).

A2 B3 C4 D5

10.下面计算正确的是( )

A <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> B <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> C <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> D <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

11.如下图,数轴上点A所表示的数是

 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

A <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> B- <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> +1 C <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> +1 D <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> -1

12 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 的大小关系是( )

A. <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> > <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> B. <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> < <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> C. <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> = <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> D.不能比较

13.如图所示,数轴上M点表示的数可能是

 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

A <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> B <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> C <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> D <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

14.若abo,则代数式 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 可化简为( )

A <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> B <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> C <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> D <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

15.有一个数值转换器,原理如图所示:当输入的=64时,输出的y等于(  )

 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

A2 B8 C3 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>  D2 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 

16.下列各组数中,互为相反数的是(

A-3 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> B <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> C <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> D <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

17.下列根式中属于最简二次根式的是( )

A <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> B <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> C <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> D <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

18.下列运算正确的是 ( )

A.  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> = ±5 B.  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> = 1 C.  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> = 9 D.  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> = 6

19.若 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ,  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 的值为( )

A.  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> B.8 C. 9 D. <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

20.已知 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 是整数,则正整数 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 的最小值是( )

A.4 B.5 C.6 D.2


二、填空题

21.计算 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> - <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> - <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> -------

22.能使等式 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 成立的x的取值范围是------

23.若a1,化简 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>1等于----------------

24.把根式a <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 根号外的a移到根号内,得 _________

25.当 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 时,代数式 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 的值是 .


三、解答题

26.阅读以下材料:观察下列等式,找找规律

 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

1)化简: <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

2)计算:  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> + <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> + <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

3)计算:  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> + <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> + <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> +……+ <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> (n≥2)

答案解析

1C.

【解析】

试题分析:根据二次根式被开方数必须是非负数的条件,要使 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 在实数范围内有意义,必须 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> . 故选C.

考点:二次根式有意义的条件.

2D.

【解析】

试题分析:最简二次根式必须满足以下两个条件:被开方数的每一个因数(或因式)的指数都小于根指数2被开方数中不含有分母,满足这两个条件的只有选项D,故答案选D.

考点:最简二次根式.

3D

【解析】 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ,即a﹣3≥0,解得a≥3;故选B

4B

【解析】解: <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 不是同类二次根式,故选B

5C

【解析】

试题分析:因为 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ,被开方数含有分母,不是最简二次根式;

 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ,被开方数含有小数,不是最简二次根式;

 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ,被开方数含有能开得尽方的因式,不是最简二次根式;

所以,这三项都不是最简二次根式;

所以符合条件的最简二次根式有3个: <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ;故选C

考点:最简二次根式.

6A

【解析】析:同类二次根式是化为最简二次根式后,被开方数相同的二次根式称为同类二次根式.把每个根式化简即可确定.

解答:解:A <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> =2 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 被开方数相同,故本选项正确;
B
 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> =3 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 被开方数不同,故本选项错误;
C
 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> =2 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 被开方数不同,故本选项错误;
D
 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> =3 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 被开方数不同,故本选项错误.
故选A

7A

【解析】

试题分析:因为 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> , <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 可得,  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ,所以 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> , <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 的值为-1,故选A

考点:非负数的性质.

8B

【解析】解: <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ,故选B.

9B

【解析】

试题分析:无理数即无限不循环小数,而 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ,所以无理数有3个,即: <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ,故选 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

考点:无理数的定义.

10B

【解析】AC.不是同类项,不能相加减,B <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ,正确

D <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> =2,故此项错误

故选B

11D

【解析】如图,BD=1--1=2CD=1,∴BC=  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ,∴BA=BC= <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

AD= <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> -2∴OA=1+ <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> -2= <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> -1,∴点A表示的数为 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> -1.故选D

12A

【解析】

试题分析:∵ <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ,

 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ,

 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> .

故选A

考点:实数大小比较.

13B

【解析】本题考查了实数与数轴的对应关系,以及估算无理数大小的能力. 先对四个选项中的无理数进行估算,再由p点所在的位置确定点M的取值范围,即可求出点P表示的可能数值.

解:设点M表示的实数为x

由数轴可知,2x32 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>33 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>4

符合题意的数为B

故选B

14C

【解析】由题意得,aob0,所以 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> = <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ,故选C

15D

【解析】由图表得,64的算术平方根是88的算术平方根是2 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> .故选D

16D

【解析】

试题分析:A-3相反数为3. BC <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ;选D

考点:相反数

点评:本题难度较低,主要考查学生对实数相反数知识点的掌握。

17A.

【解析】

试题分析:A.符合最简二次根式的定义,故此选项正确;

B <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> = <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ,不符合最简二次根式的定义,故此选项错误;

C <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ,不符合最简二次根式的定义,故此选项错误;

D.∵ <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 有意义,∴ <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ,∴ <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ,不符合最简二次根式的定义,故此选项错误.

故选:A

考点:最简二次根式.

18D

【解析】A.  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> =5,故此项错误;B.  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> = <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> = <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ,故此项错误;

C.  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> =  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> =3,故此项错误;D.  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> =  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ,故此项正确;

故选D

19A

【解析】

试题分析:根据题意得: <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ,解得: <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> .所以 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> .

故选A

考点:非负数的性质.

20C

【解析】 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 是整数,所以 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

  1. 【解析】原式= <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> - <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

22【解析】

试题分析:由题意可得, <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> ,解得x2

考点:1.二次根式的乘除法;2.二次根式有意义的条件.

23.【解析】

试题分析:∵ <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

a1

原式=1-a-1=-a.

考点: 二次根式的化简.

24.﹣ <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

【解析】

试题分析:根据二次根式的意义可知: <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 有意义,

则﹣≥0,即a0,因此,原式=﹣ <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> =﹣ <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

考点:二次根式

255

【解析】把 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> 代入 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> = <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

26(1) <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a> (2)1 (3)  <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</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/1067/" title="青岛" class="c1" target="_blank">青岛</a> <a href="/tags/1078/" title="初中" class="c1" target="_blank">初中</a>

【解析】(1)找出规律,直接利用规律解答即可.

2)先利用规律分别求出各项的值,再相加即可.

(3) 找出规律,直接利用规律解答即可