=-627^nx27.27/4^n-6-n

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=-627^nx27.27/4^n-6-n
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=-627^nx27.27/4^n-6-n
=-627^nx27.27/4^n-6-n

=-627^nx27.27/4^n-6-n
a为整数则：圆的方程为：yx27-59yx 4y-59=27