(x+2y-3)(x-2y+3)-(x-2y-3)^2乘法公式计算
问题描述:
(x+2y-3)(x-2y+3)-(x-2y-3)^2乘法公式计算
答
=[x^2-(2y-3)^2]-[x^2-2x(2y-3)+(2y-3)^2]=2x(2y-3)-2(2y-3)^2=2(2y-3)(x-2y+3)
(x+2y-3)(x-2y+3)-(x-2y-3)^2乘法公式计算
=[x^2-(2y-3)^2]-[x^2-2x(2y-3)+(2y-3)^2]=2x(2y-3)-2(2y-3)^2=2(2y-3)(x-2y+3)