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特製的門
Author:
李春培
特製的門
https://www.facebook.com/video.php?v=730160733696759&fref=nf
GeoGebra
New Resources
兩位數加法
判斷球體
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
第八周作业
Discover Resources
四邊形
二次函数的条件最值
梯形
人教A版3.1.3,空间向量的数量积分配律
阿波羅圓
Discover Topics
Quadrilaterals
Centroid or Barycenter
Addition
Random Experiments
Upper and Lower Sum or Riemann Sum