Go: package main

import "fmt"

func main() {

	for {
		var a, b, c, d, e, f float64
		var x, y float64
		i, _ := fmt.Scanf("%f %f %f %f %f %f", &a, &b, &c, &d, &e, &f)
		if i != 6 {
			return
		}

		// x = ((e * c) - (b * f)) / ((a * e) - (b * d))
		y = ((a * f) - (d * c)) / ((a * e) - (b * d))
		x = (c - b*y) / a

		fmt.Printf("%.3f %.3f\n", x, y)
	}
}

C++: #include <iostream>
#include <iomanip>
#include <vector>
using namespace std;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    // ????????§ ax+by=c, dx+ey=f ????§£?????????????????¨???????????¨???????¨????????????????(1)
    vector<vector<double>> answers;
    double a, b, c, d, e, f;
    int dump;
    while(cin >> a >> b >> c >> d >> e >> f) {
        double det = (double)(a*e-b*d);
        double ansx = (e*c+(-b)*f)/det;
        double ansy = ((-d)*c+a*f)/det;
        answers.push_back({ansx,ansy});
    }
    for(auto elm : answers) {
        cout << fixed << setprecision(3) << elm[0] << " " << elm[1] << endl;
    }

    return 0;
}

C++: #include<iostream>
#include<iomanip>
using namespace std;

int main(){
	double a11,a12,c,a21,a22,f;
	while(cin>>a11>>a12>>c>>a21>>a22>>f){
		double x,y,delta=((double)a11*a22-(double)a12*a21);
		x=((double)a22*c-(double)a12*f)/delta;
		y=((double)a11*f-(double)c*a21)/delta;
		if(x>=0){x=(double)(((int)((x*1000)+0.5))/1000);
		}else{x=(double)(((int)((x*1000)-0.5))/1000);}
		if(y>=0){y=(double)(((int)((y*1000)+0.5))/1000);
		}else{y=(double)(((int)((y*1000)-0.5))/1000);}
		cout<<fixed<<setprecision(3)<<x<<" "<<y<<endl;
	}
	return 0;
}

C++: #include<iostream>
#include<stdio.h>
using namespace std;
int main(){
 double a,b,c,d,e,f,y[1000],x[1000];
 int i=0,n;
while(scanf("%lf%lf%lf%lf%lf%lf",&a,&b,&c,&d,&e,&f) != EOF){
  y[i]=((c*d)-(a*f))/((b*d)-(a*e));
  x[i]=((c*e)-(b*f))/((a*e)-(b*d));
  i++;
}
  n=i;
  for(i=0;i < n; i++){
  if(x == 0){x = 0;}
  if(y == 0){y = 0;}
  printf("%.3lf %.3lf\n", x[i],y[i]);
  }
  return 0;
}

C++: #include <stdio.h>


int main(void){
    int a, b, c, d, e, f;
    double x, y;
    int tmp;

    while (scanf("%d %d %d %d %d %d", 
    &a, &b, &c, &d, &e, &f)==6){
        x = (e*c-b*f)/(a*e-b*d);
        y = (-d*c+a*f)/(a*e-b*d);
        // round
        tmp = ((int)(x*1000)) % 10;
        if (x<5) x -= tmp/1000;
        if (x>=5) x += (10-tmp)/1000;
        tmp = ((int)(y*1000)) % 10;
        if (y<5) y -= tmp/1000;
        if (y>=5) y += (10-tmp)/1000;
        // output
        printf("%.3f %.3f\n", x, y);
    }
    return 0;
}

C++: #include <iostream>
#include <iomanip>

int main(int argc, char **argv) {
	double a, b, c, d, e, f, x, y;
	
	while(std::cin >> a >> b >> c >> d >> e >> f) {
		y = (c * d - a * f) / (b * d - a * e);
		x = (c - b * y) / a;
		std::cout << std::fixed << std::setprecision(3) << x << " " << y << std::endl;
	}
}

C++: #include <algorithm>
#include <cmath>
#include <iomanip>
#include <iostream>
#include <list>
#include <vector>
using namespace std;

int main(int argc, char const *argv[]) {
  double x, y;
  double a, b, c, d, e, f;
  while (!(cin >> a >> b >> c >> d >> e >> f).eof()) {
    x = (e * c - b * f) / (a * e - b * d);
    y = (a * f - c * d) / (a * e - b * d);
    if (x == 0) {
      x = 0;
    }
    if (y == 0) {
      y = 0;
    }
    std::cout << fixed << setprecision(3) << x << " " << y << '\n';
  }
  return 0;
}

C++: #include<iostream>
#include<stdio.h>
using namespace std;
int main(){
double a,b,c,d,e,f;
double x,y;
while(cin >> a >> b >> c >> d >> e >> f){
  x = (double)((e*c-b*f) / (a*e-b*d));
  y = (double)((-(d*c)+a*f) / (a*e-b*d));
  if(x == 0){x = 0;}
  if(y == 0){y = 0;}
  printf("%.3f %.3f\n",x,y);
 }
}

C++: #include<stdio.h>
int main()
{
    double x,y,a,b,c,d,e,f,m,n,p;
    while(scanf("%lf %lf %lf %lf %lf %lf",&a,&b,&c,&d,&e,&f)!=EOF)
    {
        m=(b*(-f))-((-c)*e);
        n=(a*e)-(b*d);
        p=((-c)*d)-(a*(-f));
        x=m/n;
        y=p/n;
        printf("%0.3lf %0.3lf\n",x,y);

    }
    return 0;
}

C++: #include <cstdio>
int main() {
 double a,b,c,d,e,f;
 while(scanf("%lf %lf %lf %lf %lf %lf",&a,&b,&c,&d,&e,&f)!=EOF){
  printf("%f %f\n",(c * e - b * f) / (a * e - b * d),(a*f-d*c)/(a*e-b*d));
 };
 return 0;
};

C++: #include<stdio.h>
int main(void) {
	double a, b, c, d, e, f, xans, yans;
	while (scanf("%lf %lf %lf %lf %lf %lf", &a, &b, &c, &d, &e, &f) != EOF)
	{
		xans = ((e*c - f*b) / (a*e - d*b)) + 0.0005;
		yans = ((c*d - f*a) / (d*b - a*e)) + 0.0005;
		printf("%.3f %.3f\n", xans, yans);
	}
	return 0;
}

C++: #include<iostream>
#include<cstdio>
using namespace std;

int main(){
	double a,b,c,d,e,f;
	while(cin >> a >> b >> c >> d >> e >> f){
		double x = (c*e-b*f)/(a*e-b*d);
		double y = (c*d-a*f)/(b*d-a*e);
		printf("%.3f %.3f\n", x, y);
	}
}

C++: #include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;


int main() {
	ios::sync_with_stdio(false);
	int a, b, c, d, e, f;
	
	cin >> a >> b >> c >> d >> e >> f;
	double x = (e*c-b*f)/(a*e-b*d);
	double y = (-c*d+a*f)/(a*e-b*d);
	cout << fixed << setprecision(3) << x << " " << y;
	
	while(cin >> a >> b >> c >> d >> e >> f){
		cout << "\n";
		double x = (e*c-b*f)/(a*e-b*d);
		double y = (-c*d+a*f)/(a*e-b*d);
		cout << fixed << setprecision(3) << x << " " << y;
	}

}

C++: #include <iostream>
#include <iomanip>
#include <math.h>
using namespace std;

int main()
{
	double A, B, C, D, E, F, X, Y, G , H;

	while(cin >> A >> B >> C >> D >> E >> F)
	{
		G = A / D;
		D *= G;
		E *= G;
		F *= G;
		Y = (F-C) / (E-B);
		
		D /= G;
		E /= G;
		F /= G;
		H = B / E;
		D *= H;
		E *= H;
		F *= H;
		X = (F-C) / (D-A);

		X= floor(X*1000+0.5)/1000;
		Y= floor(Y*1000+0.5)/1000;

		if(Y==0){
			Y=0;
		}

		if(X==0){
			X=0;
		}

		cout<<fixed<<setprecision(3)<<X<<" "<<fixed<<setprecision(3)<<Y<<endl;
	}

	return 0;
}

C++: #include<stdio.h>
#include <stdlib.h>
#include<math.h>

int main(){
	char buf[18];
	double a,b,c,d,e,f,x,y;
	while(fgets(buf,sizeof(buf),stdin)!=NULL){
		sscanf_s(buf,"%lf %lf %lf %lf %lf %lf",&a,&b,&c,&d,&e,&f);
		x=(b*f-c*e)/(b*d-a*e);
		y=-1.0*(x*a-c)/b;
		printf("%.3lf %.3lf\n",x==0.0 ? fabs(x) : x, y==0.0 ? fabs(y) : y);
	}

    return 0;
}

C++: #include <iostream>
#include <stdio.h>

int main(void)
{
	// ax+by=c,dx+ey=f => ax+by=c,-(a/d)*dx+-(a/d)*ey=-(a/d)*f => ax+by=c,-ax-aey/d=-af/d => by-aey/d=c-af/d => (b-ae/d)y = c-af/d => y=(c-af/d)/(b-ae/d)
	// ax+by=c, ax=c-by, x=(c-by)/a
	
	signed int a, b, c, d, e, f;
	double x, y;
	
	do
	{
		if(std::cin >> a, !std::cin) break;
		std::cin >> b >> c >> d >> e >> f;
		if(!std::cin) break;
		y = (c-a*f/(double)d)/(b-a*e/(double)d);
		x = (c-b*y)/(double)a;
		printf("%.3lf %.3lf\n", x, y);
	} while(true);

	return 0;
}

C++: /*************************************************************************
	> File Name: 23.cpp
	> Author: ralph
	> Mail: 1694487365@qq.com
	> Created Time: 2018年12月21日 星期五 21时32分48秒
 ************************************************************************/

#include<bits/stdc++.h>
using namespace std;
int main()
{
    float a,b,c,d,e,f;
    while(cin>>a>>b>>c>>d>>e>>f) printf("%.3f %.3f\n",(c*e-b*f)/(a*e-b*d),(a*f-c*d)/(a*e-b*d));
}

C++: #include <iostream>
#include <iomanip>

int main()
{
	double a, b, c, d, e, f;
	while(std::cin >> a >> b >> c >> d >> e >> f) {
	    double A = e;
	    double B = - b;
	    double D = - d;
	    double E = a;
	    double det = a * e - b * d;
	    double x = (A * c + B * f) / det;
	    double y = (D * c + E * f) / det;
	    if ( x == 0 ) {
	        x = 0;
	    }
	    if ( y == 0 ) {
	        y = 0;
	    }
		
		std::cout << std::fixed << std::setprecision(3) << x << " " << y << std::endl;
	}
	return 0;
}