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不等式組
Author:
俊吉
GeoGebra
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【案例】2013年安徽高考15题
三位數除以一位數（二）
畫出對稱圖形
判斷球體
直角坐標平面上的旋轉變換
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正餘弦函數的疊合102.11.27
World's Hardest Easy Geometry Problem.
In-centre
projection01 by Mr LO WY
構作對稱圖形
Discover Topics
Pyramid
Integers
Sequences and Series
Surface
Sphere