1/x+1/y=4,则(3x+xy+3y)/(x-xy+3y)=
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1/x+1/y=4,则(3x+xy+3y)/(x-xy+3y)=
1/x+1/y=4,则(3x+xy+3y)/(x-xy+3y)=
1/x+1/y=4,则(3x+xy+3y)/(x-xy+3y)=
分子分母同时除以xy得
原式=(3/y+1+3/x )/ (1/y-1+1/x)
=(3*4+1)/(4-1)
=13/3
若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)=
已知x+y=3,xy=1,则4x+3xy+4y=
1/x+1/y=4,则(3x+xy+3y)/(x-xy+3y)=
已知1/X-1/Y=5 ,则x-2xy-y/4x+3xy-4y
已知2/x-1/y=3,则(2y-x+4xy)/(3x-6y-5xy)=?
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
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(-2xy+2x+5y)-(3xy+2y-2x)-(x+4y+xy)其中x-y=4xy=-1
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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=( )
已知x-y=3,xy=1,求(-2x+2x+3y)-(3xy+2y-2x)-(x+4y+xy)
若1/x-1/y=2,求3x-2xy-3y/x-xy-y的值3x-2xy-3y/x-xy-y 不好意思,是3x-2xy-3y/x-2xy-y
已知x-y=1,则x^4-x^3y-xy^3-3x^2y+3xy^2+y^4=
已知(x-y)/(x+y)=-1/2,则分式(x²+4xy+3y²)/(x²+2xy-3y²)的值等于
实数x,y满足x^3-y^3-3xy=1,则x-y=
|x-3y-1|+(x+y)^2=4xy求y分之x