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中点轨迹
Author:
DongHai Zhang
中点轨迹
GeoGebra
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漂亮的摇摆曲线
兩位數除以一位數（二）
讀磅
斜率的值
球体的体积推导（优化版）
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國小數與量
Indices 5
截平面
四角柱體（長方體）的截面
任務1的副本
Discover Topics
Kite
Trigonometry
Linear Functions
Histogram
Circumcircle or Circumscribed Circle