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椭圆里面光的汇聚
Author:
李大地(Field Lee)
GeoGebra
New Resources
兩位數除以一位數（一）
找出對稱軸
判斷球體
第八周作业
拼砌四邊形
Discover Resources
優良作品4(薇如)
國旗
極式：切線方向
加法(10一數的副本
比一比看谁小
Discover Topics
Rational Numbers
Statistics
Poisson Distribution
Rhombus
General Quadrilateral