计算:(2m+3n-p)²-(2m-3n+p)²
问题描述:
计算:(2m+3n-p)²-(2m-3n+p)²
答
=(2m+3n-p+2m-3n+p)(2m+3n-p-2m+3n-p)
=4m(6n-2p)
=24mn-8p抱歉啊,那个符号可能不太明显,两个算式之间有一个减号。相当于公式:A²-B²=(A+B)*(A-B)