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GeoGebra
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撒针估算面积实验
比較五件物件的重量
正方形雪花图案
盈利與虧蝕
活动三：应用性质
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n星角
均分除法（整數÷整數）
Addition and Subtraction of Polynomials(多項式的加減法)
圓錐切球
折线匀速动点工具
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Sphere
Subtraction
Parabola
Cone
Mathematics