化简:xy分之3x^2+2xy-xy分之2x^2-xy=

化简:xy分之3x^2+2xy-xy分之2x^2-xy= 当x=3,y=3分之1时,求代数出3xy-[2xy-2(xy-2分之3xy)+xy]+3xy的值 (-3分之1xy)的平方×[xy(2x-y)-2x(xy-y的平方)] （3X的平方Y-XY的平方+2分之1XY)/(-2分之一XY) 计算（-3分之1xy²）²×[xy（2x-y）+xy²]= 【xy分之（x^2+y^2)-(xy+y^2分之x^2)-(x^2+xy分之y^2)】÷xy分之3 3xy-[2xy-2（xy-2分之3xy)+xy]+3xy,其中x=3,y=负3分之一大神们帮帮忙 ①(9x²y-6xy²)÷3xy ②(3x²y-xy²+2分之1xy)÷(-2分之1xy) (xy-x^2)除以xy分之x-y 已知X+Y分之XY等于3,求-X+3XY-Y分之2X-3XY+2Y 已知x+y分之xy=2,那么3x-5xy+3y分之3xy-x-y= 若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少? 若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少? 已知X+Y分之XY=2,求-X+3XY-Y分之3X+5XY+3Y [(xy-2)2次方-(-xy-1)(xy-4)]除(-3分之1xy) 2x+2y分之3y+x^2+xy分之2xy ﹣3y²+3xy分之2xy-2x²=?分之2x 计算：2x+2y分之3y + x²+xy分之2xy