化简：x-1x2-1+xx+1．

题型：解答题难度：一般来源：南平质检

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．