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S12G4 長方形內夾正方形的周長問題
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学用数学
GeoGebra
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兩組對邊相等和有直角的四邊形
兩位數加法
球体的体积推导(优化版)
判斷球體
錐體建築師
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正方形的旋轉
分數與小數
天干與地支
翰林數學_2下_CH3-1_三角形的內角與外角
线面g
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Normal Distribution
Angles
Boxplot
Scalene Triangles
Indefinite Integral