(x-2x/x+1)除以x²-2x+1/x²-1

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(x-2x/x+1)除以x²-2x+1/x²-1(x-2x/x+1)除以x²-2x+1/x²-1(x-2x/x+1)除以x²-2x+1/x²

(x-2x/x+1)除以x²-2x+1/x²-1
(x-2x/x+1)除以x²-2x+1/x²-1

(x-2x/x+1)除以x²-2x+1/x²-1
-x/x+1 乘以(x+1)(x-1)/(x-1)^2=-x/x+1 乘以(x+1)/(x-1)=-x/(x-1)