【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
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【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【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【x
【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
【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
【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
=[(x²+y²)/xy-x²/y(x+y)-y²/x(x+y)]×xy/3
=[x²+y²-x³/(x+y)-y³/(x+y)]/3
=xy/3
(xy-x^2)除以xy分之x-y
(-3分之1xy)的平方×[xy(2x-y)-2x(xy-y的平方)]
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
y平方-2y+1分之xy-x-y-1
(xy^2-2xy+x)*y^3-y分之y^3+y^2
(xy^2-2xy+x)乘以y^3-y分之y^3+y^2
【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
（xy-x²）除以xy分之x²-2xy+y²乘以x²分之x-y
已知x-y=4xy,求x-2xy-y分之2x+3xy-2y的值!
xy分之x^2-y^2除以(x-y)
若xy/x+y=2,则3x-5xy+3y/-x+3xy-y=?/是分之
(x+2y-3xy+2x+y-xy)-(-2-y+xy),其中x+y=2分之1,xy=-2分之1
2x+2y分之3y+x^2+xy分之2xy
计算：2x+2y分之3y + x²+xy分之2xy