chuong trinh giai phuong trong bac 2:
#include "stdio.h"
#include "conio.h"
#include "math.h"
main()
{
clrscr();
float a,b,c,x1,x2,x,denta;
printf("nhap a,b,c= ");scanf("%0.2f%0.2f%0.2f",&a,&b,&c);
if(a==0)
printf("pt k phai bac 2");
else
denta=b*b-4*a*c;
if(denta<0) printf("pt vo nghiem");
else
if(denta==0) printf("nghiem kep x= %0.2f", x=c/a);
else
printf("2 nghiem:\n\tx1=%0.2f\n\tx2=%0.2f",
x1=(-b+sqrt(denta))/(2*a),
x2=(-b-sqrt(denta))/(2*a));
getch();
}
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