【計算】3秒で答えを出せる特殊計算!

2022 2:43
Synopsis
おまけ問題の解説はこちら ⇒ https://youtu.be/BHEt7gCJU4E 知っていれば3秒で解ける計算問題です。 もちろん簡単な暗算で ...
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