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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
錐體建築師
判斷球體
第八周作业
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邊長與三角形（一）
蝴蝶定理推廣證明1
三角形相似的直观显示.许兴华数学
函数作图工具的副本
GeoGebra创建的小游戏集
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Centroid or Barycenter
Congruence
Vectors 3D (Three-Dimensional)
Curve Sketching
Trigonometric Functions