运用乘法公式计算计:(m-2n+3p)(m+2n+3p)过程-v-

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运用乘法公式计算计:(m-2n+3p)(m+2n+3p)过程-v-
运用乘法公式计算计:(m-2n+3p)(m+2n+3p)
过程-v-

运用乘法公式计算计:(m-2n+3p)(m+2n+3p)过程-v-
(m-2n+3p)(m+2n+3p)
=m(m+2n+3p)-2n(m+2n+3p)+3p(m+2n+3p)
=m²+2mn+3mp-2nm-4n²-6np+3pm+6pn+9p²
=m²-4n²+9p²+6mp
=(m+3p)²-4n²

e .....

(m-2n+3p)(m+2n+3p)
=(m+3p-2n)(m+3p+2n)
=(m+3p)的平方-4n的平方
=m的平方+6mp+9p的平方-4n的平方