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鳩の巣原理_正方形（分割なし）
Author:
伊藤克典
GeoGebra
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standingwave-reflection-fixed
standingwave-reflection-free
目で見る立方体の2等分
直線の軌跡
standingwave-plus
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三斜三円術 作図のし方
数ⅡP60Q10
不定積分四択1.14
円に内接する円ーその２
三角錐の投影図
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Curve Sketching
Equations
Indefinite Integral
Parallelogram
Diagrams