【5秒以内に暗算できますか？】ちょっとだけ工夫してラクに解きたい普通の足し算！
Synopsis
数学 #計算の工夫 #足し算 暗算が得意な人なら普通にサクッと計算できるかもしれませんが、苦手な人のために工夫して計算する ...
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