化简 (a²-ab+2b²)-2(b²-a²)
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化简 (a²-ab+2b²)-2(b²-a²)
化简 (a²-ab+2b²)-2(b²-a²)
化简 (a²-ab+2b²)-2(b²-a²)
(a²-ab+2b²)-2(b²-a²)
=a²-ab+2b²-2b²+2a²
=3a²-ab
(a²-ab+2b²)-2(b²-a²)
=a²+2a²-ab
=3a²-ab
=a(3a-b)
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