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【329289】《二次根式》同步练习4

时间:2025-01-21 12:53:11 作者: 字数:2498字
简介:

二次根式练习题

双基演练

1.(-72的平方根是_______ <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> 的算术平方根是________

2.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> -  <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,则x=_______

3.当x_______时, <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> 是二次根式;能使 <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> 有意义的a的值是_______

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> 不是二次根式的条件是________

5.已知下列各式: <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≥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> <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> ,其中二次根式的个数是( )

A1B2C3D4

6.下面算式中,错误的是( )

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> =±0.03 B± <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> =±0.07

C <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> =0.15 D-  <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> =-0.13

7.面积为6cm2的正方形的边长为( )

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> cm B2cm C3cm D36cm

8.若方程(y-22=144,则y的值是( )

A10 B-10 C-1014 D12

9.若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> ,则A的算术平方根是( )

Aa2+3 B.(a2+32 C.(a2+92 Da2+9

10x为何值时,下面各式有意义:

 <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> ; 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>





  • 能力提升

11.当x_______时,在 <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> 实数范围内有意义.

12.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> + <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,则 <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> =_______

13.代数式 <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> 是二次根式,则应满足的条件是_______________。

14.式子 <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> 中,x的取值范围是( )

Ax≤3 Bx≥3 Cx>3 Dx≥3x≠4

15.使式子 <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> 有意义的未知数x有( )个.

A0 B1 C2 D.无数

16xy都是实数,且满足y< <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> ,试化简 <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> 的值.











17.已知ab为实数,且 <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> =b+4,求ab的值.










  • 聚焦中考

18.正数x的平方根是3a+1-a-3,求 <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> 的值.









19.函数y= <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> 中,自变量x的取值范围是(    )

Ax≥-1 B-1≤x≤2 C-1≤x<2 Dx<2

20.已知代数式 <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> 有意义时,字母且x的取值范围是(    )

A x>0 B x≥0   C  x>0x≠1   D  x≥0x≠1 







答案:

1±73 20 3.≥1,-1 4.≤-1

5C 6A 7A 8C 9D

10①0≤x≤1,②x>1,③x取任意实数

11<1 12 <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> 13m = 2 ,n≤2  14D 15B

161y > 0 , <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> =1   17a=5b=-4

18.(3a+1+-a-3=0

a=1x=3a+12=16

 <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> =5

19. C    20.  D


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