作业帮18．(满分8分)化简：.
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/10 22:28:14
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