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橫向橢圓
Author:
Henry Hsieh
GeoGebra
New Resources
垂直線的斜率
圓的切線方程
第八周作业
三位數除以一位數（一）
空间中两直线的位置关系
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絕對值距離和
No.4
軌跡觀察---兩圓上線段中點
謝爾賓斯基三角形
三视图
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Angles
Ratios
Tangent Line or Tangent
Linear Regression
Intersection