(2m+3n-p) (2m-3n+p)等于多少!
问题描述：
(2m+3n-p) (2m-3n+p)等于多少!
答
(2m+3n-p) (2m-3n+p)
=[2m+(3n-p)][2m-(3n-p)]
=4m²-(3n-p)²
=4m²-9n²+6np-p²