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Triangular Number 三角形數
Author:
Alex CHIK
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
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拼砌四邊形
判斷球體
球体的体积推导（优化版）
三位數除以一位數（一）
【案例】2018年全国1卷理科12题
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正二十面體
Drawing quadrilaterals on the grid or the pinboard
Section Curves
circle
Graph of Exponential function
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Terms
Limits
Numbers
Difference and Slope
Parametric Curves