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(a-2)/(a²;-1)÷(a-1)-(2a-1/a+1)=(a-2)/(a²;-1)÷[(a+1)(a-1)-(2a-1)]/a+1)=(a-2)/(a²;-1)÷(a²;-2a/a+1)=[(a-2)/(a+1)(a-1)]x(a+1)/a(a-2)=1/(a²;-a)a是方…
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