化简2x^2y-2xy+3y^2-(5x^2y+3xy-1)的结果是_____.

xy=-2,x+y=3 求(3xy+10y)+[5x-(2xy+2y-3x)]的运算过程和结果是什么 (-3分之1xy)的平方×[xy(2x-y)-2x(xy-y的平方)] xy(xy+1)+(xy+3)-2(x+y+2分之一）-(x+y-1)的平方 (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y) 若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值 已知xy/x+y=2,求代数式3x-5xy+3y/-x+2xy-y的值 已知x-y=2xy,求代数式3x-5xy-3y/x+xy-y的值 已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值 已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y= 已知xy^2=-2,求-xy（x^2y^5-xy^3-y)的值. 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) 已知：x-y=1,xy=-2.求：(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值