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長方形
Author:
Yin Kelvin Wong
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
第八周作业
異分母分數減法
兩位數除以一位數（一）
画直线等分三角形的面积
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周界
題 6
橢圓與雙曲線折紙
同頂角_2
连续开方（制作：谢建华，修订：孟宝兴）
Discover Topics
Centroid or Barycenter
Right Triangles
Cuboid
Stochastic Process or Random Process
Vectors 2D (Two-Dimensional)