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翰林數學_2下_CH3-1_三角形的外角和
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翰林數學
GeoGebra
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兩組對邊相等的四邊形
三位數除以一位數(一)
【案例】2013年安徽高考15题
拼砌四邊形
画直线等分三角形的面积
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檢驗區
三角函數-sin
相似而不断变化的正多边形.许兴华数学
y=asin(bx+theta)+c
Addition and Subtraction of Directed Numbers (2)
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Fractal Geometry
Numbers
Interest Calculation
Angles
Circle