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建中
毕氏螺线
圆锥曲线的统一定义（第二定义）
弧度制的意义的副本
中考 2019 河南-23
Discover Resources
任兩正方形重組成一大正方形partII
動畫
Quiz on Discriminant 判別式：測驗
硬幣繞多邊形面積
Test
Discover Topics
Vectors 2D (Two-Dimensional)
Numbers
Angles
Plane Figures or Shapes
Parallelogram