Go: package main

import (
        "fmt"
        "bufio"
        "os"
)

func main() {
        var a, b, c, d, e, f float64
        sc := bufio.NewScanner(os.Stdin)
        for sc.Scan() {
                fmt.Sscanf(sc.Text(), "%f %f %f %f %f %f", &a, &b, &c, &d, &e, &f)

                det := a*e - b*d
                x := (e*c - b*f) / det
                y := (a*f - c*d) / det
                fmt.Printf("%04f %04f\n", x, y)
        }
}

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

#define REP(i,n) for(int i = 0;i<(int)n;i++)
#define FOR(i,a,b) for(int i = (a);i < (b);i++)
#define RFOR(i,a,b) for(int i = (a);i>(b);i--)

using namespace std;

int main(void){
    
    int i,j=0,k = 0,l=0,m = 0,n= 0;
    double a,b,c,d,e,f;
    double x1,x2;
    
    cin >> a >> b >> c;
    cin >> d >> e >> f;
    
    double gyouretusiki = (a*e - d*b);
    
    x1 = (c/a) - (b/gyouretusiki)*(f -((d*c)/a));
    
    x2 = ((a) /(gyouretusiki))*(f-((d*c)/a));
    
    
    printf("%.3f %.3f\n",x1,x2);
    return 0;
            
                  
                  
    
}

C++: #include <cstdio>
#include <cmath>

double r(double d){
  double a = roundl(d*1000);
  if(a==0) return +0.0;
  return a/1000;
}

int main(){
  double a,b,c,d,e,f;
  while(~scanf("%lf %lf %lf %lf %lf %lf",&a,&b,&c,&d,&e,&f))
    printf("%.3f %.3f",r((c*e-b*f)/(a*e-b*d)),r((-c*d+a*f)/(a*e-b*d)));
}

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

int get_gcd(int a, int b) {
    if (a % b == 0) return b;
    return get_gcd(b, a % b);
}

int main() {
    int a,b;
    while (cin>>a>>b) {
        if (a < b) {
            int tmp = a;
            a = b;
            b = tmp;
        }

        int gcd = get_gcd(a,b);

        int lcm = (a * b) / gcd;
        cout << gcd << " " << lcm << endl;

    }
    return 0;
}

C++: #include <stdio.h>
#define EPS 1e-10
int main() {
    int a,b,c,d,e,f,x;double q,r;while (scanf("%d %d %d %d %d %d",&a,&b,&c,&d,&e,&f)!=EOF) {
        x=-a;a*=d,b*=d,c*=d;d*=x,e*=x,f*=x;q=(f+c)/(b+e+0.0);r=(f-(e*q))/(d+0.0);if (r<EPS && r>-EPS) r=0.0;if (q<EPS && q>-EPS) q=0.0;printf("%.3lf %.3lf\n",r,q);} return 0;}

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

int main(void) {
  string input;
  while (getline(cin, input)) {
    float a, b, c, d, e, f;
    sscanf(input.c_str(), "%f %f %f %f %f %f", &a, &b, &c, &d, &e, &f);
    float x = (c*e-b*f)/(a*e-b*d);
    float y = (c*d-a*f)/(b*d-a*e);
    printf("%.3f %.3f\n", x, y);
  }
}

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

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

int main() {
	int a, b, c, d, e, f;
	vector<double> x, y;
	while (cin >> a) {
		double tmpY;
		cin >> b >> c >> d >> e >> f;
		if (a*e != b*d) {
			y.push_back((c*d - a*f) / (b*d - a*e));
			tmpY = (c*d - a*f) / (b*d - a*e);
		} else {
			continue;
		}
		if (a != 0) {
			x.push_back((c - b*tmpY) / a);
		} else if (d != 0) {
			x.push_back((f - e*tmpY) / d);
		} else {
			continue;
		}
	}

	for (int i = 0; i < x.size(); i++) {
		cout << fixed << setprecision(3) << x[i] << " " << y[i] << endl;
	}
}

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

int main() {
	double a, b, c, d, e, f, xx, yy;
	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);
		cout << fixed << setprecision(3) << x << " " << y << endl;
	}

	return 0;
}

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

int main() {
	double a, b, c, d, e, f, x, y;
	cout << fixed << setprecision(3);
	while (cin >> a >> b >> c >> d >> e >> f) {
		x = (c * e - b * f) / (a * e - b * d);
		y = (c - a * x) / b;
		cout << x << " " << y << endl;
	}
	return 0;
}

C++: #include <stdio.h>

int main(){
	int a,b,c,d,e,f;
	double x,y;
	while(scanf("%d%d%d%d%d%d", &a, &b, &c, &d, &e, &f) != EOF){
		x = (e*c-b*f)/(e*a-b*d);
		y = (d*c-a*f)/(b*d-a*e);

		printf("%.3f %.3f\n", x, y);
	}
}

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

using namespace std;

int main() {
  double a, b, c, d, e, f;

  while((scanf("%lf%lf%lf%lf%lf%lf", &a, &b, &c, &d, &e, &f)) != -1) {
    double x, y;
    double denom = a * e - b *d;
    double nomer_x = c*e - b*f;
    double nomer_y = -c*d + a*f;
    x = nomer_x / denom;
    y = nomer_y / denom;

    if(x == 0) { x = 0;  }
    if(y == 0) { y = 0;  }

    printf("%.3lf %.3lf\n", x, y);
  }

  return 0;
}

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

int main() {
	double a , b, c, d, e, f, x, y;
	cin >> a >> b >> c >> d >> e >> f;
	a *= 1000;
	b *= 1000;
	c *= 1000;
	d *= 1000;
	e *= 1000;
	f *= 1000;
	y = (d * c - a * f) / (d * b - a * e);
	x = (c - b * y) / a;
	cout << x / 1000 << " " << y / 1000 << endl;
	return 0;
}

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

int main(){
	int i = 0;
	while (i<=1){
		double a, b, c, d, e, f;
		cin >> a >> b >> c >> d >> e >> f;

		double x = (c*e - f*b) / (a*e - b*d);
		cout << fixed << setprecision(3)<< x << " "<< setprecision(3)<< (c - a*x) / b;
		i++;
	}

	return 0;
}

C++: #include<iostream>
#include<iomanip>
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);
		cout << fixed << setprecision(3) << x << " " << y << endl;
	}
}

C++: #include <stdio.h>


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

    while (scanf("%lf %lf %lf %lf %lf %lf", 
    &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 <stdio.h>
double round3(double a){
	a=a*10000;
	if(int(a)%10>5)a=a+10-int(a)%10;
	a=double (int (a/10));
	a=a/10000;
	return a;
}

int main(){
	int a,b,c,d,e,f;
	double x,y;
	while((scanf("%d%d%d%d%d%d",&a,&b,&c,&d,&e,&f))!=EOF){
		if(a!=0.0){
		  y=(f-c*d/a)/(e-b*d/a);
		  x=(c-b*y)/a;
		}
		else if(d!=0.0 && b!=0.0){
		  y=c/b;
		  x=(f-e*y)/d;
		}
		else if(d==0.0){
		  x=0.0;
		  if(b!=0.0) y=c/b;
		  else if(e!=0.0) y=f/e;
		}
		round3(x);
		round3(y);
		printf("%0.3f %0.3f\n", x, y);
	}
	return 0;
}

C++: #include <iostream>
#include <vector>
#include <cstdio>

using namespace std;

int main(int argc, char *argv[]) {
  double a, b, c, d, e, f;
  vector<double> xy;

  while (true) {
    cin >> a >> b >> c >> d >> e >> f;
    if (cin.eof())
      break;
    a -= d * b / e;
    c -= f * b / e;
    double x = c / a;
    x = (int)(x * 100 + 0.5);
    x /= 100;
    double y = (f - d * x) / e;
    y = (int)(y * 100 + 0.5);
    y /= 100;
    xy.push_back(x);
    xy.push_back(y);
  }

  for (int i = 0; i < xy.size() / 2; i++)
    printf("%.3lf %.3lf\n", xy[i*2], xy[i*2+1]);
  return 0;
}

C++: #include <iostream>
#include <stdio.h>
#include <string>
#include <math.h>
#include <algorithm>
using namespace std;
int main(){
 double a, b, c, d, e, f;
 double x, y;
 while(cin >> a >> b >> c >> d >> e >> f){
  x = (c*e - b*f) / (a*e - b*d);
  y = (a*f - d*c) / (e*a - b*d);

  printf("%.3f %.3f\n",x,y);
  
 }

 return 0; 
}