化简:(-x+3y)^2
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
化简:2(3x-y)-3(x+7y)
-(5x+y)-3(2x-3y)(化简)
化简(x-y)^3乘以(y-x)^2为
化简:(x+y)+(2x+y/1*2)+(3x+y/2*3)+...+(9x+y/8*9)
化简,亲快啊啊急!(3x-2y)(7x-y)-(4x+3y)(x-y)
化简:(2x+3y)2-(2x+y)(2x-y)
2(x+y)-3分之2(x-y)-3(x+y)+3分之2(x-y)化简 其中x=-2,y=1
化简(x-3y)(3x+y)-(2x-3y)(2x-3y)
(2x+3y)(3x-2y)-(x-2y)(x+2y)化简
化简:[(x+2y)^2-(x+y)(3x-y)-5y^2]/2x
(x-y)(x-2y)-(3x-2y)(x-3y)