{(x+y)²-(x-y)²}÷(2xy)怎么做?
(x^2-xy)y÷y-x/xy怎么做?
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
因式分解(xy-1)²+(x+y-2)(x+y-2y)怎么做哇?
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
化简:[(x+y)²-(x-y)²]÷2xy
(xy-x²)²÷(x-y)²/xy·x-y/x² 计算
2x+2y/x-y与(x+y)²/xy 怎么通分
3x²-xy-4xy²-3x+4y=0怎么做
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
有谁知道数学通分X-Y/2X+2Y与XY/(X+Y)怎么做?
【(1)/(x-y)+(1)/(x-y)】÷(2x)/(x²-2xy+y²)
[(3x+y)²-(3x-y)²]÷(4x-2y)计算 怎么做?