人教版八年级数学下册全册
3a2b35x22a32ay3
)(1) ( (3)) (2)(() ( ) 2c33y3xy22x2x2y3 x32x2y2
) 5)( ) ( ) ( xy4) (4)(2) (z zyx
(6)(
y23x3x2
) ( )3 ( ) 2x2y2ay
七、课后练习
计算
2b23
(1) ( 3)
a
a22
(2) ( n 1)
b
a b2 a3c32c42a
) () (a2 b2) (3)(2) (3) ()4 (4) (abb acabab
八、答案:
3b29b2b32b6
)=2 六、1. (1)不成立,()=2 (2)不成立,(2a2a4a4a
2y33x28y39x2
)= )=2(3)不成立,( (4)不成立,( 23
3xx bx 2bx b27x
27a6b3y325x48a3x4
2. (1) (2) (3) (4) 4 922
8cz9y9y
1a3y2
(5)2 (6) 2
x4x
8b6a4
七、(1) 9 (2) 2n 2
ab
a bc2
(3)2 (4)
ba
课后反思: