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生日问题
Author:
Zhang Guangmin
Topic:
Probability
GeoGebra
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【案例】2018年全国1卷理科12题
球体的体积推导
球体的体积推导（优化版）
兩位數除以一位數（二）
兩組對邊相等的四邊形
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有趣的切圓
反正弦函數
ibooks-函數的平移
圓錐截痕
quiz 9.1 2(a)
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Trapezoid
Reflection
Parallelogram
Parametric Curves
Circumcircle or Circumscribed Circle