#include "stdio.h"void main(){scanf("%f,%f,%f,%f",&a,&b,&c,&d);printf("%f\n",2*(a+b-c));printf("%f\n",(a-b+c)*(a-b-c));printf("%f\n",(a-b-c)*(a+b+c)); printf("%f\n",(a+b-c)*(a-b+c));printf...