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从方程 (x-3)^2 + (y+2)^2 = 16 识别圆心和半径。（答： C = (3, -2) ，。）
从方程 (x-3)^2 + (y+2)^2 = 16 识别圆心和半径。（答： C = (3, -2) ，。）
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