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二面角
Author:
qianqianhouhou
二面角的概念，拖动A、E点改变半平面
GeoGebra
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三位數除以一位數（二）
【案例】2013年安徽高考15题
柱體建築師
球體建築師
四邊形的特性
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(1+x/n)^n 逼近 exp(x)
proof ASA
Quiz on Addition and Subtraction of Directed Numbers (1) 有向數加減測驗(1)
比流器3相連接方法--U,Z,Y,Δ
中华人民共和国国旗
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Equilateral Triangles
Median Value
Rhombus
Power Functions
Scalene Triangles