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鳩の巣原理_正三角形（分割あり）
Author:
伊藤克典
GeoGebra
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直線の軌跡
接点の作る円は内接円
standingwave-reflection-fixed
等積変形2
正１７角形 作図 regular 17-gon
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楕円・楕円の方程式
問題1-3
Total derivative
円の作図
Ex.5 場合の数 演習問題解答３
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Square
Vectors 2D (Two-Dimensional)
Inequalities
Rational Numbers
LCM and GCD