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定长线段在相交直线上滑动
Author:
冯伟冀
GeoGebra
New Resources
sanjiaohanshu
異分母分數減法
小数 的副本
三位數除以一位數（一）
【案例】2013年安徽高考15题
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任務1
Clock
三角形ㄛ
拋物線3-平行四邊形法
邊長與三角形
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Parabola
Similar Triangles
Incircle or Inscribed Circle
Histogram
Area