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