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两角和的余弦公式几何证明
Author:
桃篮翁
GeoGebra
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直線的斜率：水平變化 & 鉛垂變化
常见四边形是否是双心四边形
比較五件物件的重量
盈利與虧蝕
活动三：应用性质
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指數與對數的親密接觸
Solving Triangles (SSA case) 解任意三角形(SSA情況)
正十二面體
橢圓教學_2016
立体几何
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Equations
Power Functions
Linear Equations
Percentages
Trapezoid