2-[(x-y²)(3x+y)-(x+y)(3x-y²)]÷xy
[x(x²y²-xy)-y(x²-x³y)]÷3x²y
因式分解:[x(x²y²-xy)-y(x²-x³y)]÷3x²y
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
2x²-3xy=y²=0(x,y不得o)求x/y+y/x
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
化简求值[1-(2x/x+y)]÷ (x²-2xy+y²/3x+3y)+(x²+xy/x&
计算3x/8y×16y²/27x² (2xy-x²)÷x-2y/xy 2x-6/x
因式分解 (3x+2y)-(x-y)² x²-xy+3y-3x 2x²+xy-y²
计算(1)3x/8y×16y²/27x² (2)(2xy-x²)÷x-2y/xy 2x-6
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
(2x²y-2xy²)-[(-3x²y²+3x²y)+(3x²