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直線之美
Author:
李春培
直線之美
GeoGebra
New Resources
第八周作业
拼砌四邊形
兩位數除以一位數（一）
判斷球體
球体的体积推导（优化版）
Discover Resources
Classifying Quadrilaterals
同心圓內的直線2
Brahmagupta 四邊形的構造方法
拋物線2-焦點法
兩位數除三位數(商>10)
Discover Topics
Probability
Orthocenter
Median Line
Circumcircle or Circumscribed Circle
Ratios