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２次不等式の解き方
Author:
嶋津恒彦
GeoGebra
New Resources
standingwave-reflection-fixed
sine-wave
直線の軌跡
standingwave-reflection
カージオイド
Discover Resources
正１２面体基本形
コンコイド Conchoid
三角柱を切断した立体(立体図形の等積変形)
感覚と数（正三角形らしく見えますか？）
模試20-11-3
Discover Topics
Statistics
Isosceles Triangles
Matrices
Quadratic Functions
Congruence