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平行线分线段成比例定理
Author:
吕胜
GeoGebra
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球体的体积推导
斜率的值
【案例】圆柱体内放置一个大球六个小球
兩位數除以一位數（一）
【案例】2013年安徽高考15题
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y=ax²的圖形
包絡線：橢圓
密鋪
椭圆的定义
y=sinx描點
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Congruence
Sequences and Series
Straight Lines
Complex Numbers
Prism