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勒洛四面体（参数曲面法）
Author:
孟宝兴
GeoGebra
New Resources
三位數除以一位數（一）
【案例】圆柱体内放置一个大球六个小球
柱體建築師
判斷球體
第八周作业
Discover Resources
Trajectory of system: y'=sin(y)-y/2
小數試用
最短距離
小六 圓周
巧算周界
Discover Topics
Symmetry
Square
Congruence
Numbers
Power Functions