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

C++: #include <iostream>
#include <iomanip>
#include <algorithm>
 
using namespace std;
 
int det(int a, int b, int c, int d) {
    return a * d - b * c;
}
 
int main() {
    int a[6];
    while(cin) {
        for(int i = 0; i < 6; i++)
            cin >> a[i];
        if(!cin)
            break;
        int d = det(a[0], a[1], a[3], a[4]);
        int x1 = det(a[2], a[1], a[5], a[4]);
        int x2 = det(a[0], a[2], a[3], a[5]);
        cout << setprecision(3) << fixed << 1. * x1 / d + 1e-9 << " ";
        cout << setprecision(3) << fixed << 1. * x2 / d + 1e-9 << endl;
    }
 
    return 0;
}

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

struct vector2{
	float x, y;
	vector2() : x(0), y(0){}
	vector2(float x, float y) : x(x), y(y){}
};

struct sim_elem{
	float a, b, c, d, e, f;
	sim_elem() :a(0), b(0), c(0), d(0), e(0), f(0){}
	sim_elem(float a, float b, float c, float d, float e, float f) :a(0), b(0), c(0), d(0), e(0), f(0){}
};

//	a / d * d
//	ey - by = f - c
//	y / y = (f - c) / y

// ax = -by + c
// ax / a = -(by + c) / a

vector2 sim_equ(sim_elem elem){

	float dx = elem.a / elem.d * elem.d;
	float ey = elem.a / elem.d * elem.e;
	float f = elem.a / elem.d * elem.f;

	float y = ey - elem.b;
	float yr = f - elem.c;
	y = yr / y;

	float ax = -elem.b * y + elem.c;
	float x = ax / elem.a;

	return vector2(x, y);
}

//	sprintf
float placement4(float val){
	char ret[128];
	sprintf_s(ret, sizeof(ret), "%.3f", val);
	return (float)atof(ret);
}

int main(){

	sim_elem elem;
	while (cin >> elem.a >> elem.b >> elem.c >> elem.d >> elem.e >> elem.f){

		vector2 ret;
		ret = sim_equ(elem);
		printf("%.3f %.3f\n", placement4(ret.x) ,placement4(ret.y) );
	}

	return 0;
}

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

/*
??£???????¨????
	ax + by = c
	dx + ey = f
????§£x, y???????????????????????°??????
*/
int main() {
	double a, b, c, d, e, f;
	int cnt = 0;						//??\??????????????£???????¨????????????°
	std::vector<double> x_vector;		//x????§£???????´?
	std::vector<double> y_vector;		//y????§£???????´?

#if 0
	while (cnt < 1) {
		cin >> a >> b >> c >> d >> e >> f;
#else
	while (cin >> a >> b >> c >> d >> e >> f) {
#endif
		double x = (b * f - c * e) / (b * d - a * e);
		double y = (c * d - a * f) / (b * d - a * e);

		cnt++;
		x_vector.push_back(x);
		y_vector.push_back(y);
	}

	for (unsigned int i = 0; i < cnt; i++) {
		std::cout << std::fixed << std::setprecision(3) << x_vector[i] << " ";
		std::cout << std::fixed << std::setprecision(3) << y_vector[i] << endl;
	}

	cnt = 0;
	x_vector.clear();
	y_vector.clear();

	//???????????°
	//while (1);

	return 0;
}

C++: #include <math.h>
#include <iostream>
#include <ios>
#include <iomanip>
#include <algorithm>
#include <functional>
#include <string>

#define YES "YES"
#define NO "NO"
#define space ' '

using namespace std;

void func();

int main(void)
{
	
	func();

	return 0;
}

// using matrix	?????????????????´??????
void func()
{
	double a, b, c, d, e, f;
	double x, y;

	while (cin >> a >> b >> c >> d >> e >> f, !cin.eof()){


		cout << fixed << setprecision(3);


		if ((a*e - d*b) == 0)
			x = 0.0, y = 0.0;
		else {
			x = ((e*c - b*f) / (a*e - d*b));
			y = ((-(d*c) + a*f) / (a*e - d*b));


			if (x == 0)
				x = 0.0;
			if (y == 0)
				y = 0.0;
		}
		cout << x << space << y << endl;


		cout << dec;
	}
}

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

using namespace std;

double roundOff(double);

int main(void){
	for(int a, b, c, d, e, f; cin >> a >> b >> c >> d >> e >> f;){
		double delta = a * e - b * d;
		double x = roundOff((c * e - b * f) / delta);
		double y = roundOff((a * f - c * d) / delta);

        printf("%.3lf %.3lf\n", x, y);
	}
	return 0;
}

double roundOff(double a){
	a*=1000;
	a = int(a + 0.5 - (a < 0));
	a/=1000.;
	return a;
}

C++: #include<cstdio>
#include<iostream>
class GCDandLCM{
    public:
        void solve(int a,int b){
            int big=a,small=b;
            if(a<b){ 
                big=b;
                small=a;
                int tmp=a;
                a=b;
                b=tmp;
            }
            while(big%small!=0){ 
                int tmp=big%small;
                big=small;
                small=tmp;
            }
            printf("%d %d\n",small,(a*b)/small);
        }
};
int main(){ 
    GCDandLCM inst;
    int a,b;
    while(cin>>a>>b){ 
        inst.solve(a,b);
    }
}

C++: #include<stdio.h>
int main(void)
{
	int b,a,e,d,f,i,c;
	float y,x;
	while(scanf("%d %d %d %d %d %d",&a,&b,&c,&d,&e,&f)!=EOF)  {
			y=(c*d-a*f)/(b*d-a*e);
			x=(b*f-c*e)/(b*d-a*e);
		if(x<0.0001 && x>-0.0001){
			x=0.0000;
		}
		if(y<0.0&&y>-0.0001){
			y=0.0000;
		}	
		printf("%.3f %.3f\n",x,y);
	}
	return 0;
}

C++: #include<iostream>
#include<string>
#include<algorithm>
#include<map>
#include<set>
#include<utility>
#include<vector>
#include<cmath>
#include<cstdio>
#define loop(i,a,b) for(int i=a;i<b;i++) 
#define rep(i,a) loop(i,0,a)
#define pb push_back
#define mp make_pair
#define it ::iterator
#define all(in) in.begin(),in.end()
const double PI=acos(-1);
const double ESP=1e-10;
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-a*x)/b;
    
    printf("%.3f %.3f\n",x,y);
  }
  

}

C++: #include <bits/stdc++.h>
using namespace std;
int main(){
	long long a,b,c,d,e,f,X,Y;
	double x,y;
	while(cin >> a >> b >> c >> d >> e >> f){
		x=(double)(c*(a*e-b*d)-b*(a*f-c*d))/(double)(a*(a*e-b*d));
		y=(double)(a*f-c*d)/(double)(a*e-b*d);
		x*=10000;y*=10000;
		X=x;Y=y;
		if(X%10>=5){
			X+=10;
		}
		X/=10;
		X*=10;
		if(Y%10>=5){
			Y+=10;
		}
		Y/=10;
		Y*=10;
		x=X;y=Y;
		x/=10000;
		y/=10000;
		printf("%.3lf %.3lf\n",x,y);
	}
	return 0;
}

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

int main(){
	int a,b,c,d,e,f;
	while(std::cin>>a>>b>>c>>d>>e>>f){
		double x,y;
		y=(c*d-a*f)/(b*d-a*e);
		x=(c-b*y)/a;
		if(x==0)x=0;
		if(y==0)y=0;
		printf("%.3f %.3f\n",x,y);
	}
	return 0;
}

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

double shisyagonyu(double x
  if(x>0){
    x += 0.0005;
  }
  if(x<0){
    x -= 0.0005;
  }
  return x;
}

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

  while(std::cin >>a>>b>>c>>d>>e>>f){

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

    std::cout << x;
    std::cout << " " << y << std::endl;
*/
    x = shisyagonyu((c*e-b*f)/(a*e-b*d));
    y = shisyagonyu((a*f-c*d)/(a*e-b*d));

    std::cout << std::fixed;
    std::cout << std::setprecision(3) << x;
    std::cout << " " << y << std::endl;

  }
}

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){
 
    cout << fixed << setprecision(3) << ((c*e-b*f)/(a*e-b*d))  << " " << ((a*f-c*d)/(a*e-b*d)) << endl;
     
    }
 
    return 0;

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

double mround(double a){
	if(a<0)return a-0.0005;
	return a+0.0005;
}
int main(){
	double a[6];
	double x,y;
	while(cin>>a[0]>>a[1]>>a[2]>>a[3]>>a[4]>>a[5]){
		double b=a[1]/a[4];
		for(int i=0;i<3;i++)a[3+i]*=b;
		x=(a[2]-a[5])/(a[0]-a[3]);
		y=(a[2]-x*a[0])/a[1];

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


	return 0;
}