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Slope of perpendicular lines
Author:
gklwong
Slope of perpendicular lines 垂直線的斜率關係
GeoGebra
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拼砌四邊形
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四邊形的特性
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柏拉圖宇宙模型
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Q123
mooc第五讲作业单晨制作
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Step Functions
Cone
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Triangles
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