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中線定理(阿波羅尼奧斯)定理
Author:
連琨銘
GeoGebra
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球体的体积推导（优化版）
異分母分數減法
四邊形的特性
四邉形 (四年級) 教師版
拼砌四邊形
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線性組合2 三角形
正弦公式2
angle in semi-circle
畫等腰直角三角形 題3
动圆与两圆外切与内切(2)
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Area
Square
Differential Calculus
Reflection
Vectors 3D (Three-Dimensional)