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正方体的截面
Author:
张老师
GeoGebra
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兩組對邊相等和有直角的四邊形
兩位數加法
【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
拼砌四邊形
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proof 64 潘研
Question 2
tetrahedron rotational symmetric
立體圖形的特徵
一數的百分之幾是多少？
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Area
Real Numbers
Constructions
LCM and GCD
Right Triangles