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26黃國修
GeoGebra
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中华人民共和国国旗
平行線的判定
第八周作业
斐波那契螺旋弧线（表格法-可动态调节）
科氏力 (Coriolis Force)
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圖形縮放展示
Areas of squares and rectangles_Question A至E
Angles between line and planes in a cuboid
gjc090b13 二次函數的平移
我的第一个GGB绘本
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Mathematics
Cosine
Rotation
Equilateral Triangles
Line Segment