问题 解答题
化简:
x-1
x2-1
+
x
x+1
答案

x-1
x2-1
+
x
x+1

=

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

=

1
x+1
+
x
x+1

=

x+1
x+1

=1.

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