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分數棒
Author:
YIP
GeoGebra
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兩位數加法
四邉形 (四年級) 教師版
三位數除以一位數（一）
【案例】2013年安徽高考15题
直角坐標平面上的旋轉變換
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龍騰4_1-1課例2
Trajectory of system: y'=sin(y)-y/2
S2,3,5 Statistics
周界(移邊)
What's wrong
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Cylinder
Complex Numbers
Combinatorics
Translation
Multiplication