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sym1
Author:
Kwok Man Fai
GeoGebra
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【案例】2018年全国1卷理科12题
兩組對邊相等和有直角的四邊形
拼砌四邊形
球体的体积推导（优化版）
畫出對稱圖形
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棋聖加油
梯形
Solution_to_a_System_of_Linear_Equations
Exploration of the conditions for congruent triangles.
三角形的外心
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Limits
Rational Numbers
Centroid or Barycenter
Rotation
Algebra