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zhlsh-二次函数
Author:
张老师
GeoGebra
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兩組對邊相等和有直角的四邊形
【案例】2013年安徽高考15题
球体的体积推导（优化版）
GeoGebra笔记功能体验课件
拼砌四邊形
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餘弦定理
塗鴉
複合棒形圖_並列
二維點陣列變化
五組搶答
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Upper and Lower Sum or Riemann Sum
Orthocenter
Division
Angles
Set Theory