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angle between planes
Author:
johnmayhk
GeoGebra
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【案例】圆柱体内放置一个大球六个小球
算柱 (兩位數)
【案例】2013年安徽高考15题
兩位數除以一位數（二）
兩組對邊相等和有直角的四邊形
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封閉區域著色
複合形體的表面積(凹形)
王宇揚2
外心(劉虹圻 高二三26)
算幾不等式
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Ratios
Stochastic Process or Random Process
Exponent
Linear Equations
Conditional Probability