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doublehelix
Author:
lamanleung
GeoGebra
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异形操场
撒针估算面积实验
活动三：应用性质
比較五件物件的重量
斐波那契螺旋弧线（表格法-可动态调节）
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物理
ghseh 二次函數描點法上下平移-3
圓周率的應用 題A
梯形堆垛
数学试卷难点解题思路
Discover Topics
Algebra
Trigonometry
Matrices
Vectors 2D (Two-Dimensional)
Dilation