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Quiz on Percentage Change 百分改變：測驗
Author:
Alex CHIK
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
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Pitfalls of Disk/Washer Method
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Reflection = 180° Rotation about a Line
Exploring GeoGebra for the First Time
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Integer Addition
Parallel Lines by Angle Copy
BobbiSpainTrianglesFromTrianglesEDIT
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การบวกจำนวนเต็ม 2 หลัก
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