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圓錐截痕模型
Author:
陳隆期
GeoGebra
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平行線的斜率
漂亮的摇摆曲线
三位數除以一位數（二）
圓周公式的應用
祖冲之的期望：内棋与外棋
Discover Resources
交集与并集的动态展示
task 2
一組物件的幾分之幾
證明三角形內角和180度
百度
Discover Topics
Sine
Similarity Transformation or Similarity
Arithmetic Operations
Reflection
Pythagoras or Pythagorean Theorem