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Quiz on Interest 利息：測驗
Author:
Alex CHIK
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
New Resources
找出對稱軸
異分母分數減法
画直线等分三角形的面积
畫出對稱圖形
球体的体积推导（优化版）
Discover Resources
乘法公式2
分數比較
Area and Volume of a pentagonal prism(正五角棱柱的面積和體積)
四年級
立體圖形
Discover Topics
Set Theory
Arithmetic Operations
Logic
Angles
Ratios