Question

计算：（x²-1）（

1

x-1

-

1

x+1

）的结果是______．

Answer 1

（x²-1）（

1

x-1

-

1

x+1

）=

x2-1

x-1

-

x2-1

x+1

=x+1-x+1=2．
故答案为2．