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几何模版：线段关系练习
Author:
宋晓燕
GeoGebra
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盈利與虧蝕
第三周作业效果演示
三角函数 的副本
中华人民共和国国旗
第八周作业
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正五角椎
Problem1:(md+me+mf)/(ad+be+cf)=a
二年級_錐體的觀察
希羅公式
Angle of elevation and Angle of depression(仰角和俯角)
Discover Topics
General Quadrilateral
Geometric Distribution
Equations
Fractions
Trapezoid