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Author:
军云
GeoGebra
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兩位數加法
兩組對邊相等的四邊形
球體建築師
兩位數除以一位數（一）
拼砌四邊形
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Copy of 3S2 01a 平行四邊形 20151207
Heat Sink Fin
Error (誤差)
曲面指令练习（柱球转化）
三角函數 角度變換(個人認為直覺上較好理解的)(手機使用教材)
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Functions
Curve Sketching
Difference and Slope
Means
Mode