请问这个用C语言怎么打出来？

Question

Answer 1

这样吗
#include <stdio.h>
int main()
{
double a,b,c,x,y,z;
scanf("%lf %lf %lf",&x,&y,&z);
a=(x+y)/2;
b=(x+z)/2;
c=(y+z)/2;
printf("%.1f %.1f %.1f\n",a,b,c);
return 0;
}