分式的加减2/(x-1)^2-2x/(1-x)^2

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分式的加减2/(x-1)^2-2x/(1-x)^2分式的加减2/(x-1)^2-2x/(1-x)^2分式的加减2/(x-1)^2-2x/(1-x)^22/(x-1)^2-2x/(1-x)^2=2/(1

分式的加减2/(x-1)^2-2x/(1-x)^2
分式的加减2/(x-1)^2-2x/(1-x)^2

分式的加减2/(x-1)^2-2x/(1-x)^2
2/(x-1)^2-2x/(1-x)^2
=2/(1-x)^2-2x/1-x)^2
=(2-2x)/(1-x)^2
=2(1-x)/(1-x)^2
=2/(1-x)