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期末作业：车轮为什么是圆的？
Author:
李慧敏
GeoGebra
New Resources
圓周公式的應用
圓的切線方程
平行線的斜率
兩位數除以一位數（一）
画直线等分三角形的面积
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horizontal
正三角疊代
Addition and Subtraction of Directed Numbers (2)
应用与艺术
把三角形分類 的複本
Discover Topics
Arithmetic Mean
Conditional Probability
Special Points
Prism
Combinatorics