问题 解答题
化简下列各式:
(1)(
1
x-1
-
1
x+1
2
1-x
;(2)
2
3
+
2
+
3
+1
3
-1
答案

(1)原式=

(x+1)-(x-1)
(x-1)(x+1)
1-x
2

=-

2
(x-1)(x+1)
x-1
2

=-

1
x+1

(2)原式=

2
(
3
-
2
3-2
+
(
3
+1)
2
3-1

=

6
-2+2+
3

=

6
+
3

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