(m+2n-p)(m-2n+p)平方差公式怎么算?
问题描述：
(m+2n-p)(m-2n+p)平方差公式怎么算?
答
(m+2n-p)(m-2n+p)
=(m+2n-p)[m-(2n-p)]
=m^2-(2n-p)^2
=m^2-(4n^2+p^2-4np)
=m^2-4n^2-p^2+4np