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