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Author:
凉 清
GeoGebra
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比較五件物件的重量
三角函数 的副本
百分數及其應用
异形操场
第三周作业效果演示
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用極座標做時鐘
DSE Circle-ACT02B Angle at centre and circumference
兩線段和圓的關係
solid of revolution
四邊形的特性
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Equations
Multiplication
Constructions
Square
Trigonometric Functions