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兩針夾角
Author:
李春培
GeoGebra
New Resources
多邊形的面積
三位數除以一位數（一）
空间中两直线的位置关系
圓的切線方程
兩位數除以一位數（二）
Discover Resources
複合圖形(七)
翰林B4講p192-例1
ycmc P5 Math lesson 1-3
椭圆的两条垂直切线的交点轨迹
Copy of 折扣 例5
Discover Topics
Congruence
Trigonometry
Root
Addition
Conic Sections