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几何模版：构造全等三角形证明线段相等
Author:
lansesorry
GeoGebra
New Resources
空间中两直线的位置关系
平行線的斜率
三位數除以一位數（一）
圓周公式的應用
直線的斜率
Discover Resources
chapter1
國旗
L.C.M
排水法求物件體積
任務2的副本
Discover Topics
Line Segment
Congruence
Rhombus
Algebra
Plane Figures or Shapes