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An angle problem
Author:
liuzhe821
Topic:
Angles
an angle problem
GeoGebra
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【案例】圆柱体内放置一个大球六个小球
【案例】2013年安徽高考15题
異分母分數減法
三位數除以一位數（一）
兩位數除以一位數（一）
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範例：畫圈圈的筆
try_111
World's Second-Hardest Easy Geometry Problem
代入消去法
拋物線1--焦點法
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Cube
Geometry
Planes
Histogram
Right Triangles