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Quiz on Discriminant 判別式：測驗
Author:
Alex CHIK
GeoGebra
gMath 互動數學教室
http://www.geogebra.hk
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兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
判斷球體
異分母分數減法
画直线等分三角形的面积
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GeoGebra資料上傳
雨刷練習
PMC 2018-19
七巧板的副本
海螺
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Ratios
Polygons
LCM and GCD
Sphere
Definite Integral