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平行四邊形_底5_高3
Author:
keihin
GeoGebra
New Resources
折扣
科氏力 (Coriolis Force)
撒针估算面积实验
平行線的判定
活动三：应用性质
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百分數：買賣問題（Java 版）
三角形
不可能系列-滾球
tan(x) = x
圖四的副本
Discover Topics
Dilation
Probability
Quadrilaterals
Subtraction
Integers