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retangle
Author:
Ms Hui
GeoGebra
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双心四边形
平行線的判定
第三周作业效果演示
比較五件物件的重量
正方形雪花图案
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正四面體、正六面體、正八面體
rotational symmetry_1
S4 Quadratic Function
Measure of Dispersion
诱导公式五（90°+α）
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Equations
Function Graph
Trigonometry
Volume
Reflection