作业帮x方-2x/x方-1除以(x-1-{2x-1/x+1})谢
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x方-2x/x方-1除以(x-1-{2x-1/x+1})谢
x方-2x/x方-1除以(x-1-{2x-1/x+1})
谢
x方-2x/x方-1除以(x-1-{2x-1/x+1})谢
=x(x-2)/(x+1)(x-1)÷(x²-1-2x+1)/(x+1)
=x(x-2)/(x+1)(x-1)×(x+1)/x(x-2)
=1/(x-1)