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Author:
Tzeng, Shyuh-yaur
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GeoGebra
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兩組對邊相等和有直角的四邊形
異分母分數減法
四邊形的特性
錐體建築師
画直线等分三角形的面积
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正弦函数图像
分線比值
同分母分數比較_胡老師
（三）观察物体
动圆与两圆外切与内切(2)
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Sequences and Series
Quadrilaterals
Hypothesis Testing
Prism
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