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Author:
Alex CHIK
GeoGebra
gMath 互動數學教室
http://www.geogebra.hk
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平行線的判定
镂空正方体案例对比
比較五件物件的重量
球体的截面
盈利與虧蝕
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三角形全等的理由 – 題5
Graphs of Linear Equations in Two Unknowns 二元一次方程的圖像
Equal Angles, Equal Arcs and Equal Chords
畫三角形 第3題
存款試算工具
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Mathematics
Probability
Diagrams
Quadrilaterals
Differential Equation