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Author:
johnmayhk
GeoGebra
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四邊形的特性
画直线等分三角形的面积
兩位數除以一位數（二）
兩位數加法
球體建築師
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Area of square
複合圖形(七)
總結
較複雜的周界問題(一)
扇形面積公式2
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Piecewise Functions
Cylinder
Inequalities
Planes
Boxplot