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S0E2L2 几何原本的勾股定理
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学用数学
GeoGebra
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球体的体积推导
【案例】2018年全国1卷理科12题
球体的体积推导（优化版）
拼砌四邊形
三位數除以一位數（二）
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橢圓軌跡
angle at centre vs angle at circumference
作業
圖解畢氏定理
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Quadrilaterals
Mathematics
Surface
Trigonometric Functions
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