问题
解答题
先化简(1+
|
答案
(1+
)÷1 x x2-1 x
=
÷x+1 x (x+1)(x-1) x
=
×x+1 x x (x-1)(x+1)
=
，1 x-1
取x=2时，原式=
=1．1 2-1
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先化简(1+
|
(1+
)÷1 x x2-1 x
=
÷x+1 x (x+1)(x-1) x
=
×x+1 x x (x-1)(x+1)
=
，1 x-1
取x=2时，原式=
=1．1 2-1