(2a+2b)分之(a-b)-(b方-a方)分之(a方+b方)
=[(a-b)²+2(a²+b²)]/2（a-b）(a+b)
=(a²-2ab+b²+2a²+2b²)/2(a-b)(a+b)
=(3a²-2ab+3b²)/2(a-b)(a+b)
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