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封閉區域著色
Author:
侯杰材
GeoGebra
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【案例】2018年全国1卷理科12题
画直线等分三角形的面积
兩組對邊相等和有直角的四邊形
球体的体积推导（优化版）
【案例】圆柱体内放置一个大球六个小球
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學測105-2
同心圓和線段-3(線段到最外圓有小圓)
Question 2
Question 3
錯角---垂直平行綫
Discover Topics
Definite Integral
Incircle or Inscribed Circle
Quadratic Functions
Percentages
Symmetry