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(5, 5) 相对于 x^2 + y^2 = 25 的位置。（答：外部，距离 5\sqrt 2 > 5 。）
(5, 5) 相对于 x^2 + y^2 = 25 的位置。（答：外部，距离 5\sqrt 2 > 5 。）
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