3xy-( )=5xy-2 x-(5x-3y)+( )=-2x+2y

已知（x+1）*（x+1）=-Iy-1I,求2（xy-（5xy）*（5xy））-3（（xy）*（xy）-xy） 2xy+5y^2+( )=x^2+3xy 已知x^2-xy=5,xy-y^2=-3求3(x^2-xy)-xy+y^2 xy^2=-3,求-xy(x^2y^5-xy^3-y) 已知xy^2=-2,求-xy（x^2y^5-xy^3-y)的值. 已知xy^2=-2 求-xy(x^2y^5-xy^3-y) 已知xy^2=-2xy(x^2y^5-xy^3-y) xy^5-xy^4+xy-x因式分解 化简(3x^2-5xy)+{-x^2-[-3xy+2(x^2-xy)+y^2]} 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] (xy-3x²)-(-2xy-x²)+(-2x²-3)-(-5+xy) 化简（3X平方-5Xy)+{-X平方-[-3Xy+2(X平方-xy) 5xy²-{2x²y-[3xy²-(4xy²-2xy²)]}= 已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值 已知Y-x=3xy,求(5x+3xy-5y)÷(x-2xy-y) (8xy-3x平方)-5xy-2(3xy-2x平方),其中,x=2,y=-1 已知x+y分之xy=2,那么3x-5xy+3y分之3xy-x-y= 若xy/x+y=2,则3x-5xy+3y/-x+3xy-y=?/是分之