若x+y=4,x^2+y^2=6 则xy= 1+x+x^2+…+x^2004+x^2005=0 则x^2006
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若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)=
若2x^2-6xy+9y^2-4x+4=0,则y/x-x/y=若2x^2-6xy+9y^2-4x+4=0,则y/x-x/y=?
若|x-3|+(y+2)=0,则(x-y+4xy/x-y)(x+y-4xy/x+y)的值是
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2x^+xy-y^-4x+5y-6=?
若x+y=4,x-y=6,求xy(y^2+y)-y^2(xy+2x)-3xy的值.
若x+y=4 x-y=6 求xy(x^2+y)-y^2(xy+2x)-3xy的值求值
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已知2/x-1/y=3,则(2y-x+4xy)/(3x-6y-5xy)=?
1-2/x+y=xy,4y+6x=xy.求xy的解?
若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
若xy/x+y=2,则3x-5xy+3y/-x+3xy-y=?/是分之
若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
若xy/x+y=2,则3x-xy+3y/-x+3xy-y=
诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy)
x*x+xy=3,xy+y*y=2,则x*x+2xy+y*y=________?