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4.6兩角和與差的正弦、餘弦、正切(一)
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user9429
GeoGebra
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球体的体积推导
兩組對邊相等的四邊形
判斷球體
四邊形的特性
球体的体积推导（优化版）
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挑战中考压轴题1.1.3
分形几何欣赏初步：树型图
封閉著色2
數線
Copy of 包含除法（1 ÷分數）
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Translation
General Quadrilateral
Boxplot
Logarithm
Numbers