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计算(3m+2n)(7m-6n)
人气:452 ℃ 时间:2020-05-21 05:23:10
解答
(3m+2n)(7m-6n)
=3mx7m-3mx6n+2nx7m-2nx6n
=21m²-18mn+14mn-12n²
=21m²-4mn-12n²
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