(1)（a+2b)/(a+b)+2b²/(a²-b²)=（a+2b)(a-b)/(a²-b²)+2b²/(a²-b²)=(a²+ab-2b²+2b²)/(a²-b²)=a(a+b)/[(a+b)(a-b)]=a/(a-b)(2)（x²-1）/(x
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