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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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兩組對邊相等和有直角的四邊形
三位數除以一位數（一）
找出對稱軸
異分母分數減法
錐體建築師
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柏拉圖宇宙模型
柏拉圖宇宙模型
折一半
異分母分數除法
勾股定理
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Tangent Line or Tangent
Median Line
Step Functions
Unit Circle
Natural Numbers