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正九邊形
Author:
李春培
正九邊形
GeoGebra
New Resources
兩位數除以一位數(二)
画直线等分三角形的面积
【案例】2013年安徽高考15题
判斷球體
三位數除以一位數(一)
Discover Resources
百分數(小學):折扣 / 賺賠
國中統計
Angle between line & plane
椭圆的两条垂直切线的交点轨迹
正方体的三视图
Discover Topics
Plane Figures or Shapes
Angles
Surface
Rectangle
Linear Programming or Linear Optimization