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關燈遊戲3x3 Lights Out Game
Author:
侯杰材
GeoGebra
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兩位數除以一位數（一）
【案例】圆柱体内放置一个大球六个小球
【案例】2018年全国1卷理科12题
四邊形的特性
兩組對邊相等的四邊形
Discover Resources
垂足三角形
chap. 1 by ck
三角形三邊長
拋物線的開口、對稱軸、頂點
表内除法
Discover Topics
Incircle or Inscribed Circle
Linear Programming or Linear Optimization
Logic
Cosine
Median Line