M90H023：三角形重心

//公式：(a1+a2+a3/3,b1+b2+b3/3)
#include <iostream>
using namespace std;
int main(){
	 double a1=0,a2=0,a3=0;
	 double b1=0,b2=0,b3=0;
	 double x=0,y=0;
	 cin>>a1;
	 cin>>b1;
	 cin>>a2;
	 cin>>b2;
	 cin>>a3;
	 cin>>b3;
	 x=(a1+a2+a3)/3;
	 y=(b1+b2+b3)/3;
	 cout <<"("<<x<<","<<y<<")";
}