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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
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祖冲之的期望：内棋与外棋
探究三角形的全等條件
兩位數加法
直線的斜率
漂亮的摇摆曲线
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給定適當的折射率，模擬G點看到的物體成像
畢式定理 (06)
伊斯蘭窗花 0410
P6數學
手拉手模型
Discover Topics
Line Segment
Parallelogram
Arithmetic Mean
Stochastic Process or Random Process
Circle