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餘弦定理修正項及風車證明
Author:
薛鈞聰
GeoGebra
New Resources
球体的体积推导（优化版）
兩位數除以一位數（二）
兩位數加法
【案例】2018年全国1卷理科12题
算柱 (兩位數)
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proof ASA
軌跡
垂直線的斜率_hui sir
旋轉方塊
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Logic
Tangent Line or Tangent
Sphere
Unit Circle
Trigonometry