#include <stdio.h>
#include <math.h>
#include <conio.h>
void main()
{
float a, b ,c ,delta;
printf("\n giai phuong trinh bac 2: ax*x+bx+c=0");
printf("\n Nhap vao so a :");
scanf("%f",&a);
printf("\n Nhap vao so b:");
scanf("%f",&b);
printf("\n Nhap vao so c:");
scanf("%f",&c);
delta = b*b-4*a*c;
textcolor(13);
if(a==0)
cprintf("\n o phai phuong trinh bac 2");
if(delta < 0)
cprintf("\n phuong trinh vo nghiem");
else if(delta == 0)
cprintf("phuong trinh co nghiem kep: x1=x2=%f",-b/(2*a));
else if(delta > 0 && a>0)
{
cprintf(" phuong trinh co 2 nghiem phan biet:\nx1=%f",-b-sqrt(delta)/2*a);
cprintf("\nx2=%f",-b+sqrt(delta)/2*a);
}
getch();
}
[=========> Bổ sung bài viết <=========]
[QUOTE=duc_hero;2291567]
#include <stdio.h>
#include <math.h>
#include <conio.h>
void main()
{
float a, b ,c ,delta;
printf("\n giai phuong trinh bac 2: ax*x+bx+c=0");
printf("\n Nhap vao so a :");
scanf("%f",&a);
printf("\n Nhap vao so b:");
scanf("%f",&b);
printf("\n Nhap vao so c:");
scanf("%f",&c);
delta = b*b-4*a*c;
textcolor(13);
if(a==0)
cprintf("\n o phai phuong trinh bac 2");
if(delta < 0)
cprintf("\n phuong trinh vo nghiem");
else if(delta == 0)
cprintf("phuong trinh co nghiem kep: x1=x2=%f",-b/(2*a));
else if(delta > 0 && a>0)
{
cprintf(" phuong trinh co 2 nghiem phan biet:\nx1=%f",-b-sqrt(delta)/2*a);
cprintf("\nx2=%f",-b+sqrt(delta)/2*a);
}
getch();
}
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