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Nov 20th, 2019
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  1. #include<stdio.h>
  2. #include<math.h>
  3.  
  4. double det(int a1,int a2,int a3,int b1,int b2,int b3,int c1,int c2,int c3)
  5. {
  6. double M;
  7. M= a1*(b2*c3-c2*b3)-b1*(a2*c3-c2*a3)+c1*(a2*b3-b2*a3);
  8. return M;
  9. }
  10. int main()
  11. {
  12. int a1,a2,a3,b1,b2,b3,c1,c2,c3,d1,d2,d3;
  13. double D,Dx,Dy,Dz,x,y,z;
  14.  
  15. printf("PleaseInput a1,..,b1,..,c1,..\n");
  16. scanf("%d %d %d %d %d %d %d %d %d %d %d %d",&a1,&b1,&c1,&d1,&a2,&b2,&c2,&d2,&a3,&b3,&c3,&d3);
  17.  
  18. D=det(a1,a2,a3,b1,b2,b3,c1,c2,c3);
  19. Dx=det(d1,d2,d3,b1,b2,b3,c1,c2,c3);
  20. Dy=det(a1,a2,a3,d1,d2,d3,c1,c2,c3);
  21. Dz=det(a1,a2,a3,b1,b2,b3,d1,d2,d3);
  22.  
  23. x=Dx/D;
  24. y=Dy/D;
  25. z=Dz/D;
  26.  
  27. printf("X=%f\n",x);
  28. printf("Y=%f\n",y);
  29. printf("Z=%f\n",z);
  30.  
  31. return 0;
  32. }
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