[-xy^2(2x+y)-8xy)-x^2y)]除以2xy=计算

化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] x^2-xy/xy-y^2约分 [-xy^2(2x+y)-8xy)-x^2y)]除以2xy=计算 （x^2+xy/x-y)/（xy/x-y)计算 已知x-xy=8,xy-y=-9,求x+y-2xy的值 2x²y-3(2xy-xy)-xy [ 2x-6y][8-9xy]÷xy等于? xy-2x+6y-12 xy+8 因式分解：x-4xy-2xy+8y等于? (x^2+2xy+y^2-4xy)*(x^2-2xy+y^2+4xy) .(x+y-2)(x+y-2xy)+(xy-1)^2 (x^2-xy)y÷y-x/xy怎么做? (xy-x²)÷(x²-2xy+y²/xy)×（x-y/x²） x-y/x²÷x²-2xy+y²/xy*（xy-x²） 因式分解:8(x-2y)-x(7x+y)+xy. 已知xy/x+y=2,求代数式8x-5xy+8y/-x+3xy-y的值 诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy) （y/(x^2-xy)+x/(y^2-xy))除以(x-y)/(xy)