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动点函数，变量
Author:
陈宜红
GeoGebra
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斐波那契螺旋弧线（表格法-可动态调节）
第八周作业2
活动三：应用性质
撒针估算面积实验
异形操场
Discover Resources
初二奥数：全等三角形
溫室
ghseh 二次函數動畫上下平移
滑桿動晝
PA + PB
Discover Topics
Trigonometric Functions
Circle
Diagrams
Centroid or Barycenter
Definite Integral