知らないとマズイ、、塾では必ず押さえる２つの基礎 2022年度大阪星光学院中
Synopsis
【問題】 右の図で、AE＝EC、DE：EF＝2：7とします。四角形BCEDの面積が三角形DBFの面積と等しいとき、AD：DB＝1：□ ...
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