[真题]初三数学中考化简求值专项练习题及答案解析

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数学中考化简求值专项练习题

注意:此类要求的题目,如果没有化简,直接代入求值一分不得! 考点:①分式的加减乘除运算 ②因式分解 ③二次根式的简单计算

1.化简,求值:

11

1(1

1222+---÷-+-m m m m m m ), 其中m =3.

2.先化简,再求代数式22

21111

x x x x -+---的值,其中x=tan600-tan450

3.化简:x

x x x x x x x x 416

)44122(2222+-÷+----+, 其中22+=x

4.计算:332141

222+-+÷

⎪⎭

⎫ ⎝⎛---+a a a a a a a .

5.

6、先化简,再求值:13x -·32269122x x x x

x x x

-+----,其中x =-6.

7.先化简:再求值:⎝⎛⎭⎫1-1a -1÷a 2

-4a +4

a 2

-a ,其中a =2+ 2 .

8.先化简,再求值:a -1a +2·a 2+2a a 2-2a +1÷1

a 2-1,其中a 为整数且-3<a <2.

9.先化简,再求值:222211y xy x x

y x y x ++÷⎪⎪⎭

⎫ ⎝⎛++-,其中1=x ,2-=y .

10.先化简,再求值:22

22(2)42

x x x x x x -÷++-+,其中1

2x =.

11.先化简,再求值:

222

112

(

)2442x x x x x x

-÷--+-,其中2x =(tan45°-cos30°)

12.22221

(1)121

a a a a a a +-÷+---+.

13.先化简再求值:1

1

12421222-÷+--•+-a a a a a a ,其中a 满足20a a -=.

14.先化简:1

44)113(2++-÷+-+a a a a a ,并从0,1-,2中选一个合适的数作为a 的值代入求值。

15.先化简,再求值:)1

1(x -÷1

1222-+-x x x ,其中x =2

16.2222

2369x y x y y

x y x xy y x y

--÷-++++.

17.先化简,再求值:222

4441x x x x x x x --+÷-+-,其中3

2

x =.

18.(本题满分4分)当2x =-时,求221

11

x x x x ++++的值.

19..先化简,再把 x 取一个你最喜欢的数代入求值:2

)22444(22-÷+-++--x x

x x x x x

20.(本题满分6分)先化简,再选择一个你喜欢的数代入求值。2011a

a 2-2a+1÷(a+1

a 2-1+1)

21.(2011•湘潭)先化简,再求值:,其中

22.(2011•娄底)先化简:()÷

.再从1,2,3中选一个你认为合适的数作为a 的值代入求值.

23.(2011•衡阳)先化简,再求值.(x+1)2+x (x ﹣2).其中.

24.(2011•常德)先化简,再求值,(+

)÷

,其中x=2.

25.先将代数式1

1

)(2+⨯

+x x x 化简,再从-1,1两数中选取一个适当的数作为x 的值代入求值.

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