9(x-y)2-16(y-z)2
问题描述:
9(x-y)2-16(y-z)2
答
9(x-y)²-16(y-z)²
=3²(x-y)²-4²(y-z)²
=(3x-3y)²-(4y-4z)²
=【(3x-3y)+(4y-4z)】【(3x-3y)-(4y-4z)】
=(3x+y-4z)(3x-7y+4z)