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Author:
万超杰
GeoGebra
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三位數除以一位數（一）
拼砌四邊形
異分母分數減法
球體建築師
第八周作业
Discover Resources
七巧板揖人
关灯游戏
等棍的包絡線
Crayon shin-chan, Episode 1232, Cut
平面切割正立方體
Discover Topics
Right Triangles
Variance
Parallelogram
Differential Calculus
Differential Equation