658一元二次方程
#include <stdio.h>
#include <math.h>
int main()
{
float a,b,c,x1,x2;
scanf("%f%f%f",&a,&b,&c);
if(b*b-4*a*c>=0&&a!=0)
{
x1=(-b+sqrt(b*b-4*a*c))/2/a;
x2=(-b-sqrt(b*b-4*a*c))/2/a;
printf("R1 = %.5f\nR2 = %.5f",x1,x2);
}
else
{
printf("Impossivel calcular");
}
return 0;
}