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练习：

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ypx0410

#1 Created at ... [Delete] [Delete and Lock User] 
// TODO:
        double r1 = (-b+Math.sqrt(b*b-(4*a*c)))/2*a;
        double r2 = (-b-Math.sqrt(b*b-(4*a*c)))/2*a;

天线加热菌

#2 Created at ... [Delete] [Delete and Lock User]

2*a要括号的吧

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