Question

a-b分之a方-b方除以（2+ab分之a方加b方）怎么写

Answer 1

原式=(a²-b²)/(a-b)÷(2+(a²+b²)/(ab))

=(a+b)(a-b)/(a-b)×(ab)/(a+b)²

=(ab)/(a+b);

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