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蜘蛛網
Author:
許清惟
GeoGebra
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兩組對邊相等的四邊形
近似值：有效數字
兩位數加法
兩位數除以一位數（二）
第八周作业
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有趣的切圓
題 7
n星角
Ex5D#2
圆周率π的收敛极快算法（代数几何方法）
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Vectors 2D (Two-Dimensional)
Area
Numbers
Tangent Function
Tree Diagrams