so easy
等我coding
#include <stdio.h>
main()
{
float a,b,c;
FILE *fp = fopen("data.txt","r"), *fpw = fopen("result.txt","w") ;
while (fscanf(fp,"%f %f %f %*f %*f %*f %*f %*f %*f %*f\n", &a,&b,&c)==3)
fprintf(fpw,"%.2f %.2f %.2f\n",a,b,c);
fclose(fp);
fclose(fpw);
}