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Author:
陳隆期
GeoGebra
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四邉形 (四年級) 教師版
【案例】2018年全国1卷理科12题
柱體建築師
兩位數除以一位數（二）
球體建築師
Discover Resources
橢圓包絡線
GGB1
作業
圓心在同一直線上且相切的圓(半徑可改變)
巧算周界
Discover Topics
Vectors 3D (Three-Dimensional)
Secant Line or Secant
Isosceles Triangles
Arithmetic Operations
Derivative