ab分之(a-b)²-ab分之a²-b²

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ab分之(a-b)²-ab分之a²-b²
ab分之(a-b)²-ab分之a²-b²

ab分之(a-b)²-ab分之a²-b²
解
(a-b)²/ab-(a²-b²)/ab
=(a²-2ab+b²-a²+b²)/ab
=(2b²-2ab)/ab
=2b/a-2