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凸透镜成像
Author:
软 微
GeoGebra
New Resources
異分母分數減法
畫出對稱圖形
画直线等分三角形的面积
兩位數除以一位數（二）
四邉形 (四年級) 教師版
Discover Resources
soccer(final)
任意三角形兩不等圓v3
test
錯角---不平行綫
AMC
Discover Topics
Functions
Quadrilaterals
Random Experiments
Coordinates
Circumcircle or Circumscribed Circle