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Author:
15黃瀚霆
GeoGebra
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球體建築師
画直线等分三角形的面积
兩位數除以一位數（二）
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
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三角形外角和
動態文字2次函數
孟氏定理 (Menelaus' theorem)
反射(鉛垂線、水平線及斜線) Reflection (vertical line, horizontal line and line)
圆与圆的位置关系
Discover Topics
Circumcircle or Circumscribed Circle
Linear Programming or Linear Optimization
Pyramid
Arithmetic
Vectors 2D (Two-Dimensional)