Question

lim

x→1

(

1

x-1

-

2

x2-1

)=______．

Answer 1

lim

x→1

(

1

x-1

-

2

x2-1

)
=

lim

x→1

x+1-2

x2-1

=

lim

x→1

x-1

x2-1

=

lim

x→1

1

x+1

=

1

2

．
故答案为

1

2

．