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三角形的三线
Author:
Xiaoting Yuan
Topic:
Triangles
GeoGebra
New Resources
【案例】2013年安徽高考15题
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
找出對稱軸
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