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任意凸多边形的滚动
Author:
赵林
GeoGebra
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三位數除以一位數（二）
異分母分數減法
兩組對邊相等的四邊形
球体的体积推导
三位數除以一位數（一）
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尤拉線80503余欣儒螢橋國中
餘弦定理
小精靈
ie 6
除法Q2
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Translation
Set Theory
Random Variables
Difference and Slope
Optimization Problems