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【330034】16.1 二次根式

时间:2025-02-07 09:19:04 作者: 字数:2249字

 <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>  <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>

第十六章 二次根式

16.1 二次根式

课堂学习检测

一、填空题

1 <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> 表示二次根式的条件是______

2.当x______时, <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> 有意义,当x______时, <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> 有意义.

3.若无意义 <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> ,则x的取值范围是______

4.直接写出下列各式的结果:

(1) <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> _______ (2) <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> _______ (3) <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> _______

(4) <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> _______ (5) <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> _______(6) <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> _______

二、选择题

5.下列计算正确的有( )

 <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>  <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>  <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>  <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>

A.①、② B.③、④ C.①、③ D.②、④

6.下列各式中一定是二次根式的是( )

A <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> B <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> C <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> D <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>

7.当x=2时,下列各式中,没有意义的是( )

A <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> B <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> C <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> D <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>

8.已知 <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> 那么a的取值范围是( )

A <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> B <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> C <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> D <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>

三、解答题

9.当x为何值时,下列式子有意义?

(1) <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> (2) <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>





(3) <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> (4) <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>





10.计算下列各式:

(1) <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> (2) <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> (3) <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> (4) <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>







综合、运用、诊断

一、填空题

11 <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> 表示二次根式的条件是______

12.使 <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> 有意义的x的取值范围是______

13.已知 <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> ,则xy的平方根为______

14.当x=2时, <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> ________

二、选择题

15.下列各式中,x的取值范围是x2的是( )

A <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> B <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> C <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> D <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>

16.若 <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> ,则xy的值是( )

A.-7 B.-5 C3 D7

三、解答题

17.计算下列各式:

(1) <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> (2) <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> (3) <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> (4) <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>







18.当a=2b=1c=1时,求代数式 <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> 的值.









拓广、探究、思考

19.已知数abc在数轴上的位置如图所示: <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>

化简: <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> 的结果是:______________________

20已知△ABC的三边长abc均为整数,且ab满足 <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> 试求△ABCc边的长.


参考答案

1a12<1>33x<2

4(1)7(2)7(3)7(4)7(5)0.7(6)49

5C6B7D8D

9(1)x≤1(2)x0(3)x是任意实数;(4)x≤1x2

10(1)18(2)a21(3) <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> (4)6

11x≤012x≥0 <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> 13±114015B16D

17(1)π314(2)9(3) <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> (4)3618 <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> 1

19020.提示:a2b3,于是1<c<5,所以c234