标准方程:
圆:(x - x0)^2 + (y - y0)^2 = R^2
椭圆:x^2/a^2 + y^2/b^2 = 1(a > b > 0)
双曲线:x^2/a^2 - y^2/b^2 = 1(a > b > 0)
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