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Locus 軌跡(2T)
Author:
Alex CHIK
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
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sanjiaohanshu
兩位數加法
兩位數除以一位數（一）
畫出對稱圖形
算柱 (兩位數)
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三角測量02
數學傳播39卷4期, 平面幾何公式思考
三角形的心
圓周_心算題03
全景平面投影
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Real Numbers
LCM and GCD
Congruence
Straight Lines