https://www.youtube.com/watch?v=t9vmhQ2nLzw
https://pbs.twimg.com/media/GMWP-RxXcAEZKDX?format=jpg&name=large
https://www.youtube.com/watch?v=GgdZNn6N8bA
本帖最後由 day2013 於 2024-5-7 15:09 編輯
https://www.youtube.com/watch?v=vIEPu85WQts
https://www.youtube.com/watch?v=vKzr6ui5h00
https://www.youtube.com/watch?v=vxitwaE5iEM
https://pbs.twimg.com/media/GNqmfYla4AA8gO5?format=jpg&name=900x900
https://www.youtube.com/watch?v=fP3bR8-MaF4
呢套有興趣看一看 奧數題目
https://pbs.twimg.com/media/GOKJTs2bEAEP6Nz?format=jpg&name=large
