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已知两圆\({C_1}:{\left( {x - 5} \right)^2} + {\left( {y - 3} \right)^2} = 9\)和\({C_2}:{\left( {x - 2} \right)^2} + {\left( {y + 1} \right)^2} = 8\)，则两圆圆心间的距离为___.
参考答案：5
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