一.计算 1、 66 (6)6
八年级数学易错计算题专练
2、( p2 )3
3、(4 104 ) (3102 )
4 、 a5 a2 (a2 )
1 1 5、( x2 y3 ) ( x2 y)
3 2
6、(6x 4)(3x 2)
7、(4x3 y 6x2 y2 xy3 )
1
2xy (7xy2 )2 ( x2 y y2 )
7
2 1
8、 40 39 (简便计算)
3 3
9、
10、 (m n)(m n) 11、 (2m 3n)2 12、(a b)(a b)
13、 (a b c)(a b c)
14、(a b c)2
15、 (x 2)(x 2)(x2 4)
16、(x 2 y)2
17、 (3a 4b 2c)2
18、已知 a 5 ,求 a4
1 1
的值
a a4
19、已知 a b 4 , a2 b2 11 ,求(a b)2
20、已知 xa 3, xb 2 ,求 x2ab
二、分解因式:
2 2
(1) a (x 1) b (1 x)
(2) (m2 n 2 )2 4m2n 2
4
(3) x 16
2 2
(4) 6xy x 9 y
(5) x y 10x y 25
2
(6) 16 9x 2
(7) m n 4n 2
2
(8)a2 b2 4b 4
(9).
x 2 4xy 1 4 y 2
10.下列各式从左到右的变形是因式分解的是(
).
A. x 2 2x 3 (x 1)2 2 B. (x y)(x y) x 2 y 2 D. 2x 2 y 2(x y)
C. x-xy+y=(x-y)
222三、计算
解方程(一定要检验)(1)
2
12 x 3 3 x x2 9
1
(2)
1 x 1 3x 2 2 x
a2
(3)计算 a 1
a 1
答案
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