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Author:
军云
GeoGebra
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兩組對邊相等和有直角的四邊形
【案例】2018年全国1卷理科12题
找出對稱軸
四邉形 (四年級) 教師版
拼砌四邊形
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大圓在小圓上滾動
展開基本
二次曲線的準線與焦點
angles sum on a striaght line
廣義角
Discover Topics
Upper and Lower Sum or Riemann Sum
Continuity
Dilation
Arithmetic Mean
Conditional Probability