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两角和的正弦公式几何证明1
Author:
桃篮翁
GeoGebra
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球体的体积推导(优化版)
画直线等分三角形的面积
兩位數加法
判斷球體
GeoGebra笔记功能体验课件
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mmvbcvbcv
Football Puzzle - 直線盤球
垂心
我的第一个绘本
带电粒子——旋转圆
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Rotation
Sine
Calculus
Differential Calculus
Square