计算:[3a²/(a+b)](a²-b²)÷[(b-a)/(a+b)]²

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计算:[3a²/(a+b)](a²-b²)÷[(b-a)/(a+b)]²

[3a²/(a+b)](a²-b²)÷[(b-a)/(a+b)]²
=3a²(a-b)× (a+b)²/(a-b)²
=3a²(a+b)²/(a-b)

=3a²/(a+b)×(a+b)(a-b)×(a+b)²/(a-b)²
=3a²(a+b)²/(a-b)