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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <math.h>
  4. // giải hệ phương trình bậc 2:
  5. int main()
  6. {
  7.     float a,b,c,d,e,f,D,Dx,Dy;
  8.     printf("Nhap vao he so a,b,c : ");
  9.     scanf("%f%f%f",&a,&b,&c);
  10.     printf("Nhap vao he so d,e,f : ");
  11.     scanf("%f%f%f",&d,&e,&f);
  12.     D = a*e - b*d;
  13.     Dx  = c*e - b*f;
  14.     Dy = a*f - c*d;
  15.     if(D != 0)
  16.         printf("=> he phuong trinh co nghiem duy nhat :\n x = %.3f\n y = %.3f",Dx/D,Dy/D);
  17.     else{
  18.         if(Dx == 0 && Dy == 0)
  19.             printf("=> he phuong trinh co vo so nhiem.");
  20.         else
  21.             printf("=> he phuong trinh vo nghiem.");
  22.     }
  23.     return 0;
  24. }
  25.  
Success #stdin #stdout 0s 10320KB
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stdout
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Nhap vao he so a,b,c : Nhap vao he so d,e,f : => he phuong trinh co nghiem duy nhat :
 x = -1.000
 y = 2.000
https://ideone.com/lvj96d
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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