【裏ワザ】3秒で答えを出せる計算術!

2022 3:36
Synopsis
おまけ問題の解説はこちら ⇒ https://youtu.be/KbYnaZlASs0 知っている人は数秒の暗算で答えを出せる計算の裏ワザです。 応用も ...
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