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ctr to mid perd
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FSS HCF
GeoGebra
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活动三:应用性质
折扣
GeoGebra数学资源(4-8年级)
比較五件物件的重量
平行線的判定
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Homework6
test01
習題0330-2017
面積
複合棒形圖
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Limits
Probability
Coordinates
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