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Author:
luodeqin@keleshuxue.com
GeoGebra
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垂直線的斜率
漂亮的摇摆曲线
兩位數除以一位數（二）
多邊形的面積
空间中两直线的位置关系
Discover Resources
高線
消失的面積(二)
Billiard Ball
Angles formed by two straight lines and transversal
五複合正六面體
Discover Topics
Reflection
Subtraction
Matrices
Right Triangles
Parabola