#include<iostream> #include<iomanip> using namespace std; #include<algorithm> #include<math.h> #include<string> void f(double a1, double a2, double b1, double b2,double c1, double c2) { double A = a1 - a2; double B = b1 - b2; double C = c1 - c2; double delt = B * B - 4 ...