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鳩の巣原理_正方形（分割あり）
Author:
伊藤克典
GeoGebra
New Resources
正１７角形 作図 regular 17-gon 2
standingwave-reflection-fixed
二次曲線と離心率
standingwave-reflection-free
斜めドップラー
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傍心三角形の垂心
中3理科p126-p128
体5_185_ri1
click.pageX / Yの値の研究
自由端反射
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Geometry
Combinatorics
Symmetry
Statistical Characteristics
Percentages