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6(a-b)²-9(a+b)²
人气:293 ℃ 时间:2020-04-13 02:59:29
解答
6(a-b)²-9(a+b)²
=6(a²+b²-2ab)-9(a²+b²+2ab)
=6a²+6b²-12ab-9a²-9b²-18ab
=-3a²-3b²-30ab
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