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弦心距比較
Author:
謝易達
GeoGebra
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漂亮的摇摆曲线
圓的切線方程
平行線的斜率
球体的体积推导（优化版）
三位數除以一位數（一）
Discover Resources
捷徑問題
九九乘法表的認識
請自訂一個工具
HW question locus 6
作线段和角
Discover Topics
Curve Sketching
Mode
Area
Line Segment
Plane Figures or Shapes