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作垂线或平行线
Author:
龚佳林
过已知点作已知直线的垂线
GeoGebra
过已知点作已知直线的平行线
GeoGebra
New Resources
兩位數加法
找出對稱軸
兩位數除以一位數（一）
三位數除以一位數（二）
直角坐標平面上的旋轉變換
Discover Resources
任務4
Add and subtract 2
so fing
斜線2
sintx
Discover Topics
Median Value
Rotation
Differential Equation
Surface
Piecewise Functions