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任务3：平面截立方体
Author:
陈丽婷
GeoGebra
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折扣
盈利與虧蝕
斐波那契螺旋弧线（表格法-可动态调节）
活动三：应用性质
比較五件物件的重量
Discover Resources
math123456
分數加法
直線排列 3
椭圆的定义
劉徽的「割圓術」 的複本
Discover Topics
Tangent Line or Tangent
Straight Lines
Trigonometric Functions
Sphere
Vectors 2D (Two-Dimensional)