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百分數：買賣問題（Java 版）
Author:
Anthony OR 柯志明
HTML5版：
http://www.geogebratube.org/student/m64158
GeoGebra
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算柱 (兩位數)
第八周作业
異分母分數減法
四邉形 (四年級) 教師版
兩位數除以一位數（一）
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Apollonius Problem gergonne 1
angles sum of a triangle 2
空間兩直線關係
sinx & cscx
我的第一个GGB绘本
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