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垂直2
Author:
Hui Sir
GeoGebra
New Resources
画直线等分三角形的面积
拼砌四邊形
兩位數除以一位數（一）
判斷球體
【案例】圆柱体内放置一个大球六个小球
Discover Resources
圓圈圈
正四角錐
基础知识
二倍角的正切公式的证明
结果10以内加法
Discover Topics
Cube
Mathematics
Vectors 2D (Two-Dimensional)
Polygons
Dilation