18．(满分8分)化简：.
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18．(满分8分)化简：.18．(满分8分)化简：.18．(满分8分)化简：.原式=(x+1)(x-1)/(x+1)÷(x-1)²/[x(x-1)]=(x-1)÷(x-1)/x=(x-1)×
18．(满分8分)化简：.
18．(满分8分)化简：.
18．(满分8分)化简：.
原式=(x+1)(x-1)/(x+1)÷(x-1)²/[x(x-1)]
=(x-1)÷(x-1)/x
=(x-1)×x/(x-1)
=x
原式=（x+1)(x-1)/(x+1)÷[(x-1)(x-1)/x(x-1)]
=(x-1)÷[(x-1)/x]
=x
x
原式=（x-1）÷【（x-1)/x】
=x
原式=(x+1)(x-1)/(x+1)÷{(x-1)²/[x(x-1)]}
=(x-1)÷(x-1)/x
=(x-1)*x/(x-1)
=x