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四下：三角形内角和（折叠法）
Author:
钟秀群
GeoGebra
New Resources
圓的切線方程
讀磅
【案例】圆柱体内放置一个大球六个小球
平行線的斜率
圓周公式的應用
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優良作品3
切線段等長
同頂角_1
圖解直式開方
中國火柴遊戲二
Discover Topics
Conditional Probability
Differential Calculus
Median Line
Arithmetic Mean
Special Points