化简:-(x-y)+2(x-y)-3(x-y)
(x-y)(x-2y)-(3x-2y)(x-3y)
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
2(x-y)+3(x+y)2-5(x-y)-8(x+y)2-(x-y)
(X-3Y)(X+3Y)-(X+2Y)(X-4Y)-(2X-Y)2的平方
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
(x-y/x+2y)³
化简,亲快啊啊急!(3x-2y)(7x-y)-(4x+3y)(x-y)
化简:(x+y)+(2x+y/1*2)+(3x+y/2*3)+...+(9x+y/8*9)
化简:(2x+3y)2-(2x+y)(2x-y)
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y