计算:(2m+n-p)(2m-n+p)
问题描述:
计算:(2m+n-p)(2m-n+p)
答
原式=[2m+(n-p)][2m-(n-p)]
=(2m)2-(n-p)2
=4m2-(n2-2np+p2)
=4m2-n2+2np-p2.