问题
解答题
计算: (1)
(2)
(3)
(4)
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答案
(1)原式=
=1;3a-2b 3a-2b
(2)原式=
=a+2b-b-2a a-b
=-1;-(a-b) a-b
(3)原式=
=x-1 (x-1)2
;1 x-1
(4)原式=
+(x+1)(x-1) (x+1)2
=2 x+1
=x-1+2 x+1
=1.x+1 x+1
故答案为:(1)1;(2)-1;(3)
;(4)11 x-1