已知x:y=3:2,求(x²+3xy)/(xy+2xy)
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值
已知x/y=3,求(x²+2xy-3xy²)/(x²-xy+y²)
已知x^2-xy=5,xy-y^2=-3求3(x^2-xy)-xy+y^2
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xy为正整数,3xy=2x+3y+5.求xy=?
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3/(x-y)=1/xy 求(-x-2xy+y)/ (2x+3xy-2y)
已知x-y/xy=3,求分式2x+3xy-2y/x-2xy-y的值.
已知xy/x+y=3,求代数式2x-5xy+2y/x-3xy+y