(x+y-3)^2-(5x+2y-5)^2运用乘法公式化简
问题描述:
(x+y-3)^2-(5x+2y-5)^2
运用乘法公式化简
答
(x+y-3)²-(5x+2y-5)²
=[(x+y-3)+(5x+2y-5)][(x+y-3)-(5x+2y-5)]
=(6x+3y-8)(-4x-y+2)
=-(6x+3y-8)(4x+y-2)
答
(x+y-3-5x-2y+5)(x+y-3+5x+2y-5)
=(-4x-y+2)(6x+3y-8)
保证正确率