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三角函数
Author:
sk829314
GeoGebra
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画直线等分三角形的面积
兩位數除以一位數（一）
第八周作业
兩位數除以一位數（二）
球體建築師
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三角形內角和
數量與整體的相差百分率
證平行四邊形 (對角相等)
Copy of Mjerenje obujma 5
圓餅圖的副本
Discover Topics
Division
Addition
Confidence Interval
Geometric Mean
Rotation