Question

化簡

2

x2-1

÷

1

x-1

的結果是______．

Answer 1

2

x2-1

÷

1

x-1

=

2

x2-1

•（x-1）
=

2

(x+1)(x-1)

•（x-1）
=

2

x+1

．
故答案為：

2

x+1

．