填入1~9的數字,然後使每個三角型和的種數和各直線的總數為15(直線是連接三角形的線)
https://plus.google.com/u/0/104935051408093387643/posts/aZ1HC5c2ZZT#photos/104935051408093387643/albums/5897404072632472433/5897404073944769042?pid=5897404073944769042&oid=104935051408093387643圖片
收錄日期: 2021-04-24 10:20:08
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20130706000010KK02271