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圆锥曲线定义（两圆交点）
Author:
蔡永志
GeoGebra
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兩組對邊相等的四邊形
兩位數除以一位數（一）
【案例】2013年安徽高考15题
兩位數除以一位數（二）
找出對稱軸
Discover Resources
task5
圆与它的外切圆
consistent equation 3x3
塔比.依本.庫拉 勾股定理證明
两角和的正切公式几何证明
Discover Topics
Upper and Lower Sum or Riemann Sum
Power Functions
Vectors 3D (Three-Dimensional)
Pythagoras or Pythagorean Theorem
Natural Numbers