(x²-4y²)÷(2x+y)/xy×1/x(2y-x)
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
【(1)/(x-y)+(1)/(x-y)】÷(2x)/(x²-2xy+y²)
多项式因式分解 1,(x-y)³-(x-y)²(x+y) 2,x(x²-xy)-(4x
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
化简求值[1-(2x/x+y)]÷ (x²-2xy+y²/3x+3y)+(x²+xy/x&
1.化简:x²-4y²/x²+y²+2xy÷2y+x/x²+xy.
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)
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
(1)x-y/x-2y÷x^2-y^2/x^2-4xy+4y^2
化简:[(x+y)²-(x-y)²]÷2xy