[질문] 1/x+1/y=5일때 3x-2xy+3y/x+y의값은?

(3x-2xy+3y)/(x+y) -> 이렇게써주세요 ^^; 1/x+1/y=5 통분하면,(x+y)/xy=5 (3x-2xy+3y)/(x+y) =3*{(x+y)/xy}-2*(xy/xy) =3*5-2*1 =13