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方程式 x^2 + y^2 + 4x - 2y + 10 = 0 は円を表すか?(いいえ — 半径² = -5。)
方程式 x^2 + y^2 + 4x - 2y + 10 = 0 は円を表すか?(いいえ — 半径² = -5。)
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