问题
解答题
先化简再求值:(
|
答案
原式=
÷x+1+x-1 (x+1)(x-1)
=1 (x+1)(x-1)
•(x+1)(x-1)=2x,2x (x+1)(x-1)
当x=
时,原式=2×1 2
=1.1 2
先化简再求值:(
|
原式=
÷x+1+x-1 (x+1)(x-1)
=1 (x+1)(x-1)
•(x+1)(x-1)=2x,2x (x+1)(x-1)
当x=
时,原式=2×1 2
=1.1 2