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兩位數除以一位數（二）
拼砌四邊形
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）
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翰林B4講p171_類8
三節棍
正四面體的旋轉對稱
勝者即正義，可愛即正義~
运动的全等三角形.许兴华数学
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Equations
Piecewise Functions
LCM and GCD
Distributions
Isosceles Triangles