(3m-n-p)(3m+n-P)
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(3m-n-p)(3m+n-P)
(3m-n-p)(3m+n-P)
(3m-n-p)(3m+n-P)
(3m-n-p)(3m+n-P)
=[(3m-p)-n][(3m-P)+n]
=(3m-p)^2-n^2
=9m^2-6mp+p^2-n^2
=[3m-p]^2-n^2
=9m^2-6mp+p^2-n^2
(m-2n+3p)(m+3n+3p)
(3m-n-p)(3m+n-P)
(3m+n-p)(3m-n+p)
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运用乘法公式计算:(m-2n+3p)(m+2n+3p)