(3x+2y)(x-y)+(2x-y)2-(-2x-1)(2x-1)
计算:1/(2x) - 1/(x+y)((x+y)/(2x) - x - y)
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
先化简再求值:(x-2y)²-(x+2y)(x-2y)-(x-3y)(x-y).其中x²+9y
分式的加减:[(x/y-y/x)除以(x+y)+x(1/y-1/x)]除以1+x/y,其中x=5,y=2
(x-y/x+2y)³
(x-y)(x-2y)-(3x-2y)(x-3y)
1、x(x-y)(x+y)-x(x+y)^2
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
(2X-Y)²-4(X-Y)*(X+Y)-(X-Y)*(X-1)
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