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View Compilation Error

0_0_13636688_9639\Main.java:11: 错误: 已在方法 main(String[])中定义了变量 sum
        double sum=(((x2-x1)*(x2-x1))+((y2-y1)*(y2-y1)));
               ^
0_0_13636688_9639\Main.java:12: 错误: 已在方法 main(String[])中定义了变量 a
        double a=Math.sqrt(sum);
               ^
2 个错误


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