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20181227
Author:
15黃瀚霆
GeoGebra
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四邊形的特性
Earth with coastline
sanjiaohanshu
長方體平面投影 (Codex版)
近似值：有效數字
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Measuring Volume 5
gjh-g04-01 差的平方公式
加減併式與估算
周界
尺規作圖2
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Piecewise Functions
Numbers
Parametric Curves
Special Points
Curve Sketching