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从方程 x^2 + y^2 - 4x + 6y - 12 = 0 识别圆心和半径(配方法)。(答:。)
从方程 x^2 + y^2 - 4x + 6y - 12 = 0 识别圆心和半径(配方法)。(答:。)
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