double f = b*b-4*a*c;
double f2 = Math.sqrt(f);
double r1 = (-b+f2)/(2*a);
double r2 = (-b-f2)/(2*a);
double f = b*b-4*a*c; //定义变量f为浮点数double，用于接收求根公式的△。
double f2 = Math.sqrt(f); //△的平方根。用double
double r1 = (-b+f2)/(2*a); //根据求根公式分别列出两个根的运算
//添加了注释
拆细写而已，其实可以整合一起，这样会很累
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杨森-ys
double f = b*b-4*a*c;
double f2 = Math.sqrt(f);
double r1 = (-b+f2)/(2*a);
double r2 = (-b-f2)/(2*a);