[問題] 數學問題
某甲從1-10中選一個自然數 某乙也從1-10中選一個自然數 若兩人選的數相乘為3的倍數 試問有幾種方法?
圖片一直傳不上來
想了很久想不出來
有人可以救救我嗎謝謝~
-----
Sent from JPTT on my iPhone
--
※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 223.136.167.76
※ 文章網址: https://www.ptt.cc/bbs/SENIORHIGH/M.1445058490.A.F9B.html
推
10/17 13:33, , 1F
10/17 13:33, 1F
→
10/17 13:33, , 2F
10/17 13:33, 2F
推
10/17 13:38, , 3F
10/17 13:38, 3F
→
10/17 14:04, , 4F
10/17 14:04, 4F
→
10/17 14:23, , 5F
10/17 14:23, 5F
推
10/17 16:04, , 6F
10/17 16:04, 6F
→
10/17 17:14, , 7F
10/17 17:14, 7F
→
10/17 18:39, , 8F
10/17 18:39, 8F
→
10/17 18:39, , 9F
10/17 18:39, 9F
推
10/17 20:09, , 10F
10/17 20:09, 10F
→
10/17 20:09, , 11F
10/17 20:09, 11F
推
10/17 20:10, , 12F
10/17 20:10, 12F
→
10/17 20:11, , 13F
10/17 20:11, 13F
推
10/17 20:13, , 14F
10/17 20:13, 14F
推
10/17 20:18, , 15F
10/17 20:18, 15F
→
10/17 20:18, , 16F
10/17 20:18, 16F
推
10/17 20:47, , 17F
10/17 20:47, 17F
→
10/17 20:47, , 18F
10/17 20:47, 18F
→
10/17 20:48, , 19F
10/17 20:48, 19F
→
10/17 20:49, , 20F
10/17 20:49, 20F
→
10/17 20:50, , 21F
10/17 20:50, 21F
→
10/17 20:51, , 22F
10/17 20:51, 22F
推
10/17 21:16, , 23F
10/17 21:16, 23F
→
10/17 21:16, , 24F
10/17 21:16, 24F
推
10/18 00:46, , 25F
10/18 00:46, 25F
推
10/18 13:38, , 26F
10/18 13:38, 26F
討論串 (同標題文章)