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【329290】《二次根式》同步练习5

时间:2025-01-21 12:53:15 作者: 字数:1459字
简介:

二次根式习题

双基演练

1.数a没有算术平方根,则a的取值范围是( ).

Aa>0 Ba≥0 Ca<0 Da=0

2.已知 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> 有意义,那么是一个_______数.

3.计算:

1)(- <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> 2 2- <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>2 3)( <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>  <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>2 4)(-3 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> 2



4.把下列非负数写成一个数的平方的形式:

15 23.4 3 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>4xx≥0



  • 能力提升

5.已知 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> + <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> =0,求xy的值.






6.在实数范围内分解下列因式:

1x2-2 2x4-9




33x2-5  (4x2-2 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> +2



  • 聚焦中考

7.若 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> ,则m+n的值是______。

8.已知 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> ,那么a+b的值是______。

  9.已知直角三角形两边xy满足, <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>  则第三边长为_________


答案:

1C 2.非负数

3.(1)(- <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> 2 =3 2- <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>2=-3

3)( <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>  <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>2= <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> ×6= <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> 4)(-3 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> 2=9× <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> =6

4.(15= <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>2 23.4= <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>2

3 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> = <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>2 4x= <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>2x≥0

 5 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> xy=34=81

6.1x2-2=x+ <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> )(x- <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>

2x4-9=x2+3

(3)x2-3=x2+3)(x+ <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> )(x- <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>

4x2-2 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> +2=x2-2 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> x+ <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>2=x- <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> 2  

 7. 2    8. 3 9 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/896/" title="根式" class="c1" target="_blank">根式</a>