【受験算数】10秒以内に解けるひらめき面積問題!

2022 3:03
Synopsis
おまけ問題の解説はこちら ⇒ https://youtu.be/B0diw1pI-Rk 「長方形ABCDを対角線ACで折り返したところ、三角形CDFの各辺の ...
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