标题: 请教一道prep数学，题目看不懂。。。 [打印本页] 作者: cocolvke 时间: 2010-4-13 20:44 标题: 请教一道prep数学，题目看不懂。。。 The function f is defined for all positive integers n by the following rule: f(n) is the number of positive integers each of which is less than n and has no positive factor in common with n other than 1. If p is any prime number then f(p) =?