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三角形的外心
Author:
侯杰材
GeoGebra
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算柱 (兩位數)
【案例】2013年安徽高考15题
找出對稱軸
柱體建築師
三位數除以一位數（一）
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垂直線的斜率_hui sir
平面幾何新路
拋物線4-平行四邊形法
線的面化
文繞圖2
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Line Segment
Root
Coordinates
Frequency Distribution
Equations