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平行四边形的面积公式推导
Author:
海清
GeoGebra
New Resources
双心四边形
比較五件物件的重量
第八周作业
斐波那契螺旋弧线（表格法-可动态调节）
撒针估算面积实验
Discover Resources
擲兩個硬幣的機率分布
Quiz on Index Notation 指數記數法：測驗
kkklkl
some circles
Copy of 平行四邊形的面積
Discover Topics
Quadrilaterals
Probability
Subtraction
Parametric Curves
Conic Sections