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拋物線6--包絡線法
Author:
33陳郁婷
GeoGebra
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正方形雪花图案
斜率的值
空间中两直线的位置关系
圓的切線方程
探究三角形的全等條件
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平移動畫（平移加滑桿）
Compare areas by cutting shapes Q3
circle
二次函數
Quiz on Addition and Subtraction of Directed Numbers (2)
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Circle
Confidence Interval
Random Experiments
Square
Correlation