› 看板 Math 關於我們 聯絡資訊
作者Proakis (John G. Proakis)
看板Math
標題[中學] AMC
時間Sun Mar 13 00:03:52 2011
How many three-digit numbers are composeed of three distinct digits such that one digit is the average of the other two? -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 111.83.123.206