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正三角形在长方形边上移动加滚动
Author:
赵林
GeoGebra
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兩位數除以一位數（一）
判斷球體
兩組對邊相等的四邊形
兩位數加法
【案例】圆柱体内放置一个大球六个小球
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橢圓軌跡
乘法
ｃｉｒｃｌｅ ｓｅｇｍｅｎｔ
平行四邊形堆垛
Graph of Trigonometry
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Random Variables
Ratios
Stochastic Process or Random Process
Constructions
Translation