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VG08b 函数的切线
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学用数学
GeoGebra
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兩組對邊相等的四邊形
判斷球體
球體建築師
找出對稱軸
四邉形 (四年級) 教師版
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zhengming
第一冊
最小距離和
rotational symmetry_3
圓形移動面積
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Special Points
Exponent
Area
Logic
Rectangle