问题
解答题
计算 (1)20050-22+(
(2)
(3)
(4)
|
答案
(1)原式=1-4+3
=0;
(2)原式=3-3x (x-1)2
=-3(x-1) (x-1)2
=-
;3 x-1
(3)原式=4+2(a-2)-(a+2) (a+2)(a-2)
=a-2 (a+2)(a-2)
=
;1 a+2
(4)原式=
•(a+1)(a-1) (a+1)2 a+1 a(a-1)
=
.1 a