【早ワザ】3秒の暗算でサクッと答えを出せる計算テク!

2023 2:18
Synopsis
おまけ問題の解説はこちら ⇒ https://youtu.be/lqumJ2SUAVg あることを覚えていると数秒の暗算で正解できる計算式です。
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