xy^2-5x^2y+1/2xy^2+2/3x^y

5x^2y/-1/2xy*3xy^2 ((xy+2)(xy-2)-2x²y²+5(xy-y)²)÷(2xy) 5xy^2-{2x^y-[3xy^2-（xy^2-2x^2y）]/（-1/2xy）} .(x+y-2)(x+y-2xy)+(xy-1)^2 x^2-xy/xy-y^2约分 2x²y-3(2xy-xy)-xy 计算3xy[2xy-x(y-2)+x-1] 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] 已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y= (x^2+2xy+y^2-4xy)*(x^2-2xy+y^2+4xy) (-2xy+2x+5y)-(3xy+2y-2x)-(x+4y+xy)其中x-y=4xy=-1 已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值 若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)= (-1/3xy)^2•[xy(2x-y)-2x(xy-y^2)] xy(xy+1)+xy+3-2(x+y+1/2)-(x+y-1)^2因式分解 x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2 5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2) (-3分之1xy)的平方×[xy(2x-y)-2x(xy-y的平方)]