1-(x-y)/(x+2y)÷(x²-y²)/(x²+4xy+4y²),化简
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
化简(x²y-4y²)/(x²+4xy+4y²)*[(4xy)/(x-2y)+x
1.化简:x²-4y²/x²+y²+2xy÷2y+x/x²+xy.
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
多项式因式分解 1,(x-y)³-(x-y)²(x+y) 2,x(x²-xy)-(4x
化简:(2x-y)²-4(x-y)(x+y)
化简:(x²+y²/x-y)-(2xy/x-y)
(-4X²Y)(-X²Y²)÷1\2XY 的三次方
化简:[(x+y)²-(x-y)²]÷2xy
(-x-2y)(x²-2xy+4y²)