X+y=3 xy=-5 Xy=?
X+y=3 xy=-5 Xy=?
已知x^2-xy=5,xy-y^2=-3求3(x^2-xy)-xy+y^2
已知x^-xy=5,xy-y^=-3,求式子3(x^-xy)-xy+y^的值
已知xy^2=-2,求-xy(x^2y^5-xy^3-y)的值.
已知xy^2=-2 求-xy(x^2y^5-xy^3-y)
已知x+y分之xy=2,那么3x-5xy+3y分之3xy-x-y=
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
已知,xy/x+y=3,求代数式3x-5xy+3y/-x+3xy-y的值
已知xy/x+y=3,求代数式3x-5xy+3y/-x+3xy-y的值.
已知X+Y分之XY=2,求-X+3XY-Y分之3X+5XY+3Y
已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值
已知xy/x+y=3,求代数式2x-5xy+2y/x-3xy+y