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折正三角形
Author:
cherry910502
GeoGebra
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畫出對稱圖形
sanjiaohanshu
拼砌四邊形
三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
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平行線的斜率_hui sir
Geogebra 與解析幾何
圓形
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Random Experiments
Fractions
Differential Calculus
Sine
Optimization Problems