[(X+Y)²-(X-Y)²-4X²Y²]/(2XY)
x²/xy-x/y
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
(-x-2y)(x²-2xy+4y²)
化简(x²y-4y²)/(x²+4xy+4y²)*[(4xy)/(x-2y)+x
计算:(xy-x²)×x-y/xy
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
(x-6y)/(x²-4y²)+(2y)/(x²-2xy)
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy
多项式因式分解 1,(x-y)³-(x-y)²(x+y) 2,x(x²-xy)-(4x
2x+y=0,求4x²+2xy(x+y)+y³
1.化简:x²-4y²/x²+y²+2xy÷2y+x/x²+xy.