问题
解答题
化简计算: (1)1-
(2)
|
答案
(1)原式=1-
•a-1 a a(a+2) (a+1)(a-1)
=1-a+2 a+1
=a+1-(a+2) a+1
=-
;1 a+1
(2)原式=
÷x-2 x2 x-2 x
=
•x-2 x2 x x-2
=
.1 x
化简计算: (1)1-
(2)
|
(1)原式=1-
•a-1 a a(a+2) (a+1)(a-1)
=1-a+2 a+1
=a+1-(a+2) a+1
=-
;1 a+1
(2)原式=
÷x-2 x2 x-2 x
=
•x-2 x2 x x-2
=
.1 x