已知(xy)/(x+y)=6求(3x-2xy+3y)/(-x+3xy-y)的值.
已知xy/x+y=6,求3x-2xy+3y/-x+3xy-y的值.
已知x/y=2,求 [x^2-xy+3xy^2 ] / [ x^2+xy+6y^2]的值
已知xy^2=-2,求-xy(x^2y^5-xy^3-y)的值.
已知xy/x+y =3,求2x-3xy+2y/-x+3xy-y 的值.
已知xy/x+y=3,求2x-3xy+2y/-x+3xy-y的值
已知xy/x+y=2,求代数式3x-xy+3y/-x+3xy-y的值
已知x-y/xy=3,求分式2x+3xy-2y/x-2xy-y的值.
已知3x=xy+3y,求2x+xy-2y/y-x-xy的值
已知xy/x+y=2,求代数式3x-5xy+3y/-x+2xy-y的值
已知x-y=2xy,求代数式3x-5xy-3y/x+xy-y的值
已知y-x-2xy=0,求3x+xy-3y/y-xy-x的值
已知y-x-2xy=0,求(3x+xy-3y)\(y-xy-x)的值