【中学受験算数】平面図形 正三角形の分割 2019年 早稲田実業学校中等部【最難関クラス/偏差値up】
Synopsis
三角形の分割問題です。求めたいそれぞれの三角形の割合をどう出すか、まず方針をしっかり固めましょう。ややこしい線が ...
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