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Quiz on Solving Quadratic Inequalities 解二次不等式：測驗
Author:
Alex CHIK
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
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兩位數加法
四邉形 (四年級) 教師版
畫出對稱圖形
兩位數除以一位數（二）
拼砌四邊形
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三角形的內心軌跡
座標網格的複數映射
二元算機不等是的一個無字證明
正立方體裁邊 (Chamfered Cube)
榔头和它的展开图
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Numbers
Optimization Problems
Rational Numbers
Variance
Pie Chart or Circle Chart