a friend of mine = a friend of my friends 吗?

a friend of mine=?my friends a friend of mine = a friend of my friends 吗? One of my friends等于a friend of mine吗? a friend of mine= my friend a friend of mine=my friend吗 one of my friends=a friend of mine吗?有什么区别 a friend of mine. a friend of mine a friend of my还是a friend of mine a friend of mine能否说成one of my friends 关于a friend of mine a close friend of mine 和my close friend 有区别吗