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20160623
Author:
蔡孟達
GeoGebra
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畫出對稱圖形
算柱 (兩位數)
近似值：有效數字
國旗 (Claude 版)
Nested spiral octagon
Discover Resources
直线倾斜角与斜率
ggb-fs-b1
Activity 2
圆的有关概念
繪畫四邊形
Discover Topics
Terms
Cosine
Trapezium
Random Experiments
Indefinite Integral