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计算：[3a²/(a+b)](a²-b²)÷[(b-a)/
计算：[3a²/(a+b)](a²-b²)÷[(b-a)/(a+b)]²
计算：[3a²/(a+b)](a²-b²)÷[(b-a)/(a+b)]²
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)