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Author:
chen mingchuan
GeoGebra
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柱體建築師
球體建築師
找出對稱軸
球体的体积推导（优化版）
三位數除以一位數（一）
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了解為何 d(lnx)/dx = 1/x
三角形內接正方形
複合棒形圖: 圖二
滾出直線滾出直線
二倍角的正弦公式的证明
Discover Topics
Orthocenter
Quadratic Equations
Geometric Distribution
Addition
Intersection