若x+y=3,xy=2,则(5x+2)-(3xy-5y)=( )
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若xy/x+y=2,则3x-5xy+3y/-x+3xy-y=?/是分之
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若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )
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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=
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若1/x-1/y=2,则(3x+xy-3y)/(x-xy-y)的值为?
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求(3x^+y^-5xy)-【2x^-(-4xy-y^+7x^)】=?
求(3x^+y^-5xy)-【2x^-(-4xy-y^+7x^)】=?