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圆在底面滚动动画
Author:
赵林
GeoGebra
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兩位數除以一位數（一）
三位數除以一位數（二）
【案例】2013年安徽高考15题
兩組對邊相等的四邊形
算柱 (兩位數)
Discover Resources
圖一
垂直線的斜率關係
How to draw a decagon with ruler and compasses?
切割正二十面體(直)
線性規劃例6
Discover Topics
Vectors 3D (Three-Dimensional)
Upper and Lower Sum or Riemann Sum
Scalene Triangles
Statistics
Multiplication