難しい算数の問題合ってたわ
https://www.nenkin.go.jp/oshirase/taisetu/2024/202404/0401.html#:~:text=%E6%94%AF%E6%8F%B4%E7%B5%A6%E4%BB%98%E9%87%91-,1%E7%B4%9A%E3%80%806%2C638%E5%86%86%E2%80%BB2,-2%E7%B4%9A%E3%80%805%2C310
https://redfuku.com/notes/9rkd0bhubc
RE: https://ririse.net/notes/9ubt4zd894