计算(1)3/x-6/1-x-x+5/x2-x;(2)x/x2-2x+1÷(x+1/x2-1+1).

问题描述:

计算
(1)

3
x
-
6
1-x
-
x+5
x2-x

(2)
x
x2-2x+1
÷(
x+1
x2-1
+1).

(1)原式=

3
x
+
6
x-1
-
x+5
x(x-1)
=
3x-3+6x-x-5
x(x-1)
=
8(x-1)
x(x-1)
=
8
x

(2)原式=
x
(x-1)2
÷
x+1+x2-1
(x+1)(x-1)
=
x
(x-1)2
(x+1)(x-1)
x(x+1)
=
1
x-1