1)【(a+1)/(a²-a)+4/(1-a²)】÷(a-1)=2)【a-(a²-b²+1)/a】÷【(b-1)/a】×【1/(a+b)】=3)(2x²-6x)/(x²-9)-(x+3)/(3-x)-(2x+6)/(x²+6x+9)=3
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