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割線與切線
Author:
官長壽(longlife)
GeoGebra
New Resources
异形操场
直線的斜率：水平變化 & 鉛垂變化
比較五件物件的重量
科氏力 (Coriolis Force)
双心四边形
Discover Resources
填色
堆剁蕊
奈格爾點與葛爾崗點互為等距共軛點
test
图中的三角形面积何时最小？（许兴华数学）
Discover Topics
Linear Programming or Linear Optimization
Diagrams
Interest Calculation
Rational Numbers
Conic Sections