Question

化简

x-2

x2-1

÷

2x+2

x2+2x+1

+

1

x-1

，再选择一个你喜欢的值代入求值．

Answer 1

原式=

x-2

(x+1)(x-1)

×

(x+1)2

2(x+1)

+

1

x-1

=

x-2

2(x+1)

+

1

x-1

=

x-2

2(x-1)

+

2

2(x-1)

=

x

2(x-1)

，
当x=2时，原式=

2

2×(2-1)

=1．