2a(a—b)—2a²十3ab

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2a(a—b)—2a²十3ab2a(a—b)—2a²十3ab2a(a—b)—2a²十3ab=2a²-2ab-2a²+3ab=ab

2a(a—b)—2a²十3ab
2a(a—b)—2a²十3ab

2a(a—b)—2a²十3ab
=2a²-2ab-2a²+3ab
=ab