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正方形内外弦图
Author:
数豆豆
GeoGebra
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【案例】2018年全国1卷理科12题
兩位數加法
錐體建築師
球体的体积推导（优化版）
找出對稱軸
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三角形與邊上一點求正三角形
EnergyMath 2-3 n次方根
sinx & cscx
Question 1
三圓外切2
Discover Topics
Circle
Similarity Transformation or Similarity
Rotation
Sine
Reflection