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邱仲民
GeoGebra
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兩位數除以一位數（一）
sanjiaohanshu
四邉形 (四年級) 教師版
【案例】2013年安徽高考15题
兩組對邊相等和有直角的四邊形
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凸透镜成像
分蛋糕
Perpendicular lines
Christmas Tree
[洋葱] 四边形与旋转变换
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Exponent
Step Functions
Functions
Exponential Functions
Straight Lines