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圓例2
Author:
陳柄何
GeoGebra
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四邊形的特性
兩位數除以一位數（一）
兩位數除以一位數（二）
【案例】2013年安徽高考15题
兩組對邊相等的四邊形
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數線的繪製
Similar triangles reasons 2
Copy of 分數與小數
圆锥曲线统一定义单晨
Slope of a tangent 切線斜率
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Surface
Continuity
Fractions
Logarithmic Functions
Sphere