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GeoGebra
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讀磅
探究三角形的全等條件
垂直線的斜率
三位數除以一位數(一)
球体的体积推导(优化版)
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數學操作課程_20150920
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transformation_enlarge/reduction
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翰林數學_2下_CH3-1_三角形的內角與外角