(2x-y)-2(3x-1/2y)化简
化简:(x+y)+(2x+y/1*2)+(3x+y/2*3)+...+(9x+y/8*9)
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
1) (x+y)^2-(x+y)^3 2) (x-y)^2-(x-y)^3 3)(x-y)^2-(y-x)^3 因式分解
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
先化简再求值:(x-2y)²-(x+2y)(x-2y)-(x-3y)(x-y).其中x²+9y
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
(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(
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
2(x-y)+3(x+y)2-5(x-y)-8(x+y)2-(x-y)