若m=x^3-3x^2y+2xy^2+3y^3,n=x^3-2x^2y+xy^2-5y^3,则2x^3-7x^y+5xy

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若m=x^3-3x^2y+2xy^2+3y^3,n=x^3-2x^2y+xy^2-5y^3,则2x^3-7x^y+5xy^2+14y^3的值是
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2x^3-7x^y+5xy^2+14y^3=3(x^3-3x^2y+2xy^2+3y^3)-(x^3-2x^2y+xy^2-5y^3)
=3m-n

若m=x^3-3x^2y+2xy^2+3y^3,n=x^3-2x^2y+xy^2-5y^3,则2x^3-7x^y+5xy 已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y= 若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值 (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y) [-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y- 已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( ) 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,那么3x-5xy+3y分之3xy-x-y= 已知xy/x+y=3,求代数式2x-5xy+2y/x-3xy+y 已知xy/x+y=2,求代数式3x-5xy+3y/-x+2xy-y的值已知X+Y分之XY=2,求-X+3XY-Y分之3X+5XY+3Y