化简1x+1-1x-1的结果是______．

题型：填空题难度：一般来源：不详

化简

1

x+1

-

1

x-1

的结果是______．

答案

1

x+1

-

1

x-1

=

x-1

(x+1)(x-1)

-

x+1

(x+1)(x-1)

=

x-1-x-1

(x+1)(x-1)

=-

2

(x+1)(x-1)

．
故答案为：-

2

(x+1)(x-1)

．