问题
解答题
计算: (1)
(2)(
(3)(
(4)(
|
答案
(1)原式=
×(a+1)(a-1) (a+2)2
=a+2 a+1
;a-1 a+2
(2)原式=
×(x-2)2-(x+2)2 (x+2)(x-2)
=-x(x-2) x2
;8 x+2
(3)原式=[
-x+2 x(x-2)
]×x-1 (x-2)2
=x x-4
×x-4 x(x-2)2
=x x-4
;1 (x-2)2
(4)原式=1-0.25-0.25+1=2-0.5=1.5.
故答案为
、-a-1 a+2
、8 x+2
、1.5.1 (x-2)2