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萬花筒
Author:
陳隆期
GeoGebra
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近似值：有效數字
直角坐標平面上的旋轉變換
拼砌四邊形
算柱 (兩位數)
兩組對邊相等和有直角的四邊形
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圓錐
四角柱
四次函數圖形觀察
二元线性规划的图解法(18.2 例4)
验证勾股定理
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Geometric Transformations
Geometry
Rotation
Circumcircle or Circumscribed Circle
Derivative