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同位角__水平平行綫
Author:
chanfushun
GeoGebra
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双心四边形
常见四边形是否是双心四边形
画直线等分三角形的面积
平行線的斜率
【案例】2018年全国1卷理科12题
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近似值：小數位及有效數字
初犯九點圓
圆与它的外切圆
Locus (Two points 1)
正方体展开图的副本
Discover Topics
Cylinder
Poisson Distribution
Inequalities
Power Functions
Mathematics