2015年4月20日
(日本語バージョン) 数学の問題(なぞなぞみたい)を共有します。これわかりますか…? 自分でも本当いうと、まだちょっとスッキリしないんだけど.. 娘に何度も解説してもらいました。 そいれにしても、これなぞなぞみ…
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