#include <stdio.h>
main()
{
   double R1, R2, R3, RRES;
   printf("Introduisez les valeurs pour R1, R2 et R3 : ");
   scanf("%lf %lf %lf", &R1, &R2, &R3);
   RRES=R1+R2+R3;
   printf("Resistance resultante serielle   : %f\n", RRES);
   RRES=(R1*R2*R3)/(R1*R2+R1*R3+R2*R3);
   printf("Resistance resultante parallele  : %f\n", RRES);
   return 0;
}