3x^2 2xy 3y^2＝1为什么是个椭圆�？感觉并化不成椭圆的标准方程。？知乎 Sketch Coloring Page

3x^2 2xy 3y^2＝1为什么是个椭圆�？感觉并化不成椭圆的标准方程。？知乎 Template

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