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凹透镜
Author:
myao1999
GeoGebra
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算柱 (兩位數)
拼砌四邊形
【案例】2013年安徽高考15题
四邉形 (四年級) 教師版
【案例】圆柱体内放置一个大球六个小球
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橢圓
Projection of vector in R2
基測數學100-1-30 ：等腰三角形求角度
橢圓關係
夹逼法确定无理数根号2的范围
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Equations
Intersection
Real Numbers
Circle
Addition