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chen mingchuan
GeoGebra
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兩組對邊相等和有直角的四邊形
拼砌四邊形
【案例】2013年安徽高考15题
球体的体积推导（优化版）
兩組對邊相等的四邊形
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Angles in the Circumference and the Centre
切線段等長
gdss
hkdse 2014 by mr lo wy
立體旋轉卡片
Discover Topics
Poisson Distribution
Random Experiments
Differential Calculus
Symmetry
Exponential Functions