[Just for fun] 已知a, b, c是正實數且(a+b)(b+c)(c+a)=1，求ab+bc+ca的最大值。🤓 Tags: 14 comments 14 likes 1 shares Share this: 史丹福狂想曲 About author not provided 5816 followers 5189 likes "http://drstanford.blogspot.hk/" View all posts