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9(3a-2b)²-4(a+3b)²
人气:257 ℃ 时间:2020-05-09 09:09:47
解答
9(3a-2b)²-4(a+3b)²
=[3(3a-2b)]²-[2(a+3b)]²
=[3(3a-2b)+2(a+3b)][3(3a-2b)-2(a+3b)]
=11a(7a-12b)
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