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祖暅原理
Author:
孟宝兴
GeoGebra
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三位數除以一位數（一）
【案例】2013年安徽高考15题
兩組對邊相等和有直角的四邊形
兩位數除以一位數（一）
判斷球體
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KidEdu
Classification of Triangles 三角形的分類
大樂透開獎機
複合圖形(六)
Ex5D#8
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Trigonometry
Line Segment
Vectors 2D (Two-Dimensional)
Volume
Angles