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Properties of a Parallelogram
Author:
Lttcmooc
GeoGebra
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兩組對邊相等的四邊形
三位數除以一位數（一）
球体的体积推导（优化版）
球體建築師
錐體建築師
Discover Resources
折射的現象
Rounding Quiz (Significant Figures) 有效數字：測驗
四塊面積
Activity 2
平面截正方体
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Special Points
Bar Chart or Bar Graph
Intersection
Ellipse
Logarithmic Functions