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正弦定理
Author:
yuchengda
GeoGebra
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【案例】2018年全国1卷理科12题
拼砌四邊形
GeoGebra笔记功能体验课件
四邉形 (四年級) 教師版
柱體建築師
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扇形:圖片與動畫使用
Lissajous curves(利薩如圖形)
螺旋正方形
六上：圆的面积公式推导
指數函數與對數函數圖形圖形(同底)
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Reflection
Means
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Logarithm
Surface