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运动的波源
Author:
罗臻
GeoGebra
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直線的斜率
球体的体积推导
多邊形的面積
球体的体积推导（优化版）
垂直線的斜率
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testing
數學傳播39卷4期, 平面幾何公式思考
選修數學
圖解畢氏定理
手拉手模型
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Function Graph
Inequalities
Perimeter
Logarithmic Functions
Symmetry