OHTA Shinya: "Devdoping Teaching Materials for Figures-Reconstructing the Problem that "Find the earthquake center using the distance from earthquake center to the given three points of the map""Journal of Japan Society of Mathematics Education(Supplement
OHTA Shinya: "Devdoping Teaching Materials for Figures-Reconstructing the Problem that "Find the earthquake center using the distance from earthquake center to the given three points of the map""Journal of Japan Society of Mathematics Education(Supplement
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太田真也：《图形教学材料的开发——重构“利用地震中心到地图上给定三点的距离求地震中心”的问题》《日本数学教育学会会刊》（增刊）
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