化简1— x-y/x+2y÷x²-y²/x²+4xy+4y²
化简(x²y-4y²)/(x²+4xy+4y²)*[(4xy)/(x-2y)+x
1.化简:x²-4y²/x²+y²+2xy÷2y+x/x²+xy.
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:[(x+y)²-(x-y)²]÷2xy
(-x-2y)(x²-2xy+4y²)
【(1)/(x-y)+(1)/(x-y)】÷(2x)/(x²-2xy+y²)
x²+xy/(x-4y)(x+y),其中x=4,y=-1
x²+y²+2xy分之x²-4y² ÷x²+xy分之2y+x
(x²+2xy+y²分之x²-4y²)÷(x²+xy分之x+2y)
4/X+1/Y=2,XY=-1,求代数式4Y-X/X-2Y/(x+2y-12Y²/x-2y)的值