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