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waaachen
Author:
陳兪宏
與雙曲線相切圓半徑證明
GeoGebra
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拼砌四邊形
算柱 (兩位數)
找出對稱軸
【案例】2013年安徽高考15题
画直线等分三角形的面积
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橢圓軌跡 (2)
部分佔全部的百分率 :例2
量角器
仰角和俯角
仿真时钟2.0
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Right Triangles
Logic
Quadratic Equations
Exponential Functions
Linear Equations