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Author:
赵林
GeoGebra
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判斷球體
異分母分數減法
兩位數除以一位數（二）
兩組對邊相等的四邊形
錐體建築師
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方格紙
自我練習
qr code for symmetry
數學電腦繪圖&解題
正方体展开的动态
Discover Topics
Correlation
Symmetry
Circle
LCM and GCD
Solids or 3D Shapes