Question

化简：x2?1x2?2x+1=x+1x?1x+1x?1，2x?21?x2=-2x+1-2x+1

化简：x2?1x2?2x+1=x+1x?1x+1x?1，2x?21?x2=-2x+1-2x+1．

Answer 1

x2?1

x2?2x+1

=

(x?1)(x+1)

(x?1) 2

=

x+1

x?1

；

2x?2

1?x2

=-

2(x?1)

(x?1)(x+1)

=-

2

x+1

．
故答案为

x+1

x?1

；-

2

x+1

．