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运用乘法公式计算:(m-2n+3p)(m+2n+3p)
人气:277 ℃ 时间:2020-03-26 13:04:00
解答
(m-2n+3p)(m+2n+3p)
=[(3p+m)+2n][(3p+m)-2n]
=(3p+m)^2-(2n)^2
=9p^2+6pm+m^2-4n^2
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