若|x+y-3|+(x-y+5)²,则xy=
若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )
若x-y=1,xy=5,则x²y-xy²=?
若x²+xy+5y=3,y²+xy+5x=-3,求x+y的值.
若x²+xy+5y=3,y²+xy+5x=-3,求x+y的值
若x²+xy+5y=3,y²+xy+5x=-3,求x+y旳值
若1/x+1/y=2,则(2x-xy+2y)÷(3x+5xy+3y)
已知1/x=1/y+3,则(5x+xy-5y)/(x-xy-y)的值为( )
已知x+y=5,xy=3,x³+y³=(x+y)(x²-xy+y²),则1/x&
若x+y=3,xy=2,则(5x+2)-(3xy-5y)=( )
若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
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