回复：回复：回复：回复：有没有好办法？

来源: 于 2011-07-14 12:01:02 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

If f(5) = the other root, then the graph of f passes through 2, twice, making 3 roots for f(f(x)).