Question

4(x-5y)^2-2(4x-5y)(2x-y)-3(y-2x)^2

Answer 1

题目应该是这样的吧： (4x-5y)-2(4x-5y)(2x-y)-3(y-2x) 原式=[(4x-5y)+(2x-y)][(4x-5y)-3(2x-y)] =(6x-6y)(-2x-2y) =-12(x-y)(x+y) 抱歉,定向思维做的怪,原题目没有问题,可以做如下 原式=(4x-40xy+100y)-(16x-28xy+10y)-(12x-12xy+3y) =87y-24x =3[(根号29)y+(2又根号2)x][(根号29)y-(2又根号2)x]