學校舊照，相信是七十年代某初中數學堂，隱約見黑（綠？）板上寫著某題：
If 
（希望沒有看錯）
最下一行似乎正在回答該問題，應該是未寫完吧，但方法似乎頗麻煩（但我始終看不清，不能定奪）。無論如何，初中同學可以試試這幾十年前的數。
Hint:
By the given,
Hence, the answer is 
↧
Channel:
Quod Erat Demonstrandum
X
Are you the publisher?
Claim or
contact us
about this channel.
X
0
Channel Details:
- Title: Quod Erat Demonstrandum
- Channel Number: 8448121
- Language: Chinese
- Registered On: February 27, 2013, 7:14 am
- Number of Articles: 265
- Latest Snapshot: January 25, 2022, 11:21 pm
- RSS URL: http://johnmayhk.wordpress.com/feed
- Publisher: https://johnmayhk.wordpress.com
- Description: 數里無人到，山黃始知秋。岩間一覺醒，忘卻百年憂。
- Catalog: //demonstrandum57.rssing.com/catalog.php?indx=8448121
© 2025 //www.rssing.com