问题
解答题
化简求值：(
|
答案
(
-1 x-1
)•(x-1 x+1
)=1 x
•(x+1)-(x-1) (x-1)(x+1)
=x2-1 x
•2 (x-1)(x+1)
=(x+1)(x-1) x 2 x
当x=
时，原式=2
=2 2
．2
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化简求值：(
|
(
-1 x-1
)•(x-1 x+1
)=1 x
•(x+1)-(x-1) (x-1)(x+1)
=x2-1 x
•2 (x-1)(x+1)
=(x+1)(x-1) x 2 x
当x=
时，原式=2
=2 2
．2