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作业

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public class Main1 {

    public static void main(String[] args) {

        double a = 1.0;

        double b = 3.0;

        double c = -4.0;

        // 求平方根可用 Math.sqrt():

        // System.out.println(Math.sqrt(2)); ==> 1.414

        // 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);

        System.out.println(r1);

        System.out.println(r2);

System.out.println(r1 == 1 && r2 == -4 ||r1 == -4 && r2 == 1? "测试通过" : "测试失败");

    }

}


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