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下和與上和
Author:
侯杰材
下和與上和
GeoGebra
New Resources
画直线等分三角形的面积
垂直線的斜率
兩位數除以一位數（二）
【案例】圆柱体内放置一个大球六个小球
球体的体积推导
Discover Resources
題 3
轴对称
Drag A or X
正方体展开图的副本
长方体切割为小正方体
Discover Topics
Rectangle
Unit Circle
Geometry
Statistics
Mathematics