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数学
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合并同类项：6a的平方-2ab-2(3a的平方-1/2ab)
人气：348 ℃ 时间：2019-12-19 12:37:50
解答
6a²-2ab-2(3a²-1/2ab)
=6a²-2ab-6a²+ab
=-ab
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