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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
New Resources
四邉形 (四年級) 教師版
兩組對邊相等和有直角的四邊形
四邊形的特性
兩位數除以一位數（二）
錐體建築師
Discover Resources
Vertex Form of Quadratic Functions(2) 二次函數的圖像：頂點式(2)
練習
證平行四邊形 (對邊相等)
Copy of 固定周界的長方形的面積變化
學測指考
Discover Topics
Trigonometric Functions
Parabola
Quadrilaterals
Pie Chart or Circle Chart
Geometric Transformations