(2*a);
    x2=(-b+sqrt(dr))/(2*a);
    printf(“x1=%.2f x2=%.2f\n“，x1，x2);
    }
    if(dr==0)
    {
    x1=(-b+sqrt(dr))/(2*a);
    printf(“x=%.2f\n“，x1);
    }
    if(dr0)
    {
    x1=(-b-sqrt(dr))/(2*a);
    x2=(-b+sqrt(dr))/(2*a);
    printf(“(x1=%.2f，y1=%.2f)“，x1，a1*pow(x1，3)+b1*pow(x1，2)+c*x1+d1);
    printf(“(x2=%.2f，y2=%.2f)\n“，x2，a1*pow(x2，3)+b1*pow(x2，2)+c*x2+d1);
    }
    if(dr==0)
    {
    x1=(-b+sqrt(dr))/(2*a);
    printf(“(x=%.2f，y=%.2f)\n“，x1，a1*pow(x1，3)+b1*
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