【中学受験算数】平面図形・30度問題の発展・面白い算数問題【難関クラス偏差値up】
Synopsis
15年ぐらい前に自作した問題のようです。昔、作った模試をあさっていて見つけました。記憶にはないんですけど……面白い問題 ...
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