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<stdio.h>
#include<stdlib.h>
#include<iostream>
#include<string>
#include<vector>
#include<math.h>
#include<queue>
#include <algorithm>
#include<functional>
#include<cstdlib>
#include<cmath>


#define REP(i, n) for(int i = 0;i < n;i++)
#define REPR(i, n) for(int i = n;i >= 0;i--)
#define FOR(i, m, n) for(int i = m;i < n;i++)
#define FORR(i, m, n) for(int i = m;i >= n;i--)
#define CI cin >>
#define CO cout <<
#define E << endl;

using namespace std;

typedef pair<int, int> P;
typedef pair<long, long> LP;
typedef pair<int, P> PP;
typedef pair<long, LP> LPP;



int dy[] = { 0, 0, 1, -1, 0 };
int dx[] = { 1, -1, 0, 0, 0 };

int A = 0, B = 0, K = 0, T = 0, W = 0, N = 0, H = 0;
int n = 0;
double L = 0;
double S = 0;
double ar = 0, br = 0, cr = 0;
int answer = 0;

string C;
string sA, strB;
vector<vector<char>> map;
vector<double> num;
vector<string> str;

int sum = 0;

vector<int> value;
vector<int> weight;

int dp[110][10010];

int data_[210][2] = { -2 };

void input(void) {

	return;
}


int main(void) {

	int a = 0, b = 0, c = 0, d = 0, e = 0, f = 0;
	double x = 0;
	double y = 0;

	while (scanf_s("%d%d%d%d%d%d", &a, &b, &c, &d, &e, &f) != EOF) {
		y = (double)(c * d - a * f) / (double)(b * d - a * e);
		x = (double)(c - b * y) / (double)a;
		printf("%.3f %.3f\n", x, y);
	}



	return 0;
}

C++: #include<stdio.h>
 
int main(){
    int  s=100000;
 
    int n;
    scanf("%d",&n);
 
 
    for(;n--;){
        if(int(s*1.05)%1000==0){
            s=int(s*1.05);
        }else{
            s= int(s*1.05) + (1000- int(s*1.05) % 1000);
        }
    }
    printf("%d\n",s);
 
    return 0;
}

C++: #include <iostream>
#include<string>
#include<cmath>
#include<algorithm>
#include<cctype>
#include<queue>
#include<stack>
#include<stdio.h>
#include<vector>
#include<set>
#include<map>
#include<iomanip>
#define rep(i,n) for(int i=0;i<n;i++)
typedef int long long ll;

using namespace std;
int main(){

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

C++: #include<stdio.h>
int a,b, c, d, e, f;

int main()
{
while(scanf("%d",&a)!=EOF)
	{
		double x,y;
		scanf("%d %d %d %d %d",&b,&c,&d,&e,&f);
		x=(e*c-b*f)/(e*a-b*d);
		y=(c-a*x)/b;
		printf("%0.3f %0.3f",x,y);
	}
}

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

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

	return 0;
}

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

void func(double, int);

int main(){

	double a, b, c, d, e, f, x, y, del;
	
	while(cin >> a){
	
		cin >> b >> c >> d >> e >> f;
		
		del = a * e - b * d;
		x = (c * e - b * f) / del;
		y = (a * f - c * d) / del;
		
		func(x, -4);
		func(y, -4);
		cout << fixed;
	  cout.precision(3);
	  cout << x << " " << y << endl;
	}

	return 0;
}

void func(double x, int n){
	
	x *= pow(10, -n-1);
	round(x);
	x *= pow(10, n+1);	

}

C++: #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 del = 1/(a*e - b*d);
		printf("del:%lf\n",del);
		printf("%.3lf %.3lf\n",e*c*del-b*f*del,-d*c*del+a*f*del);
	}
	
	return 0;
}

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

float a,b,c,d,e,f;
double    round( double val, int precision )
{
    double    ret;
    char    buf[256] = {'\0'};
    char    *p;

    sprintf( buf, "%.*f", precision, val );
    ret = strtod( buf, &p );

    return ret;
}
int main (){
  scanf("%f %f %f %f %f %f",&a,&b,&c,&d,&e,&f);
  double x,y;
  x=(f*b/e-c)/(d*b/e-a);
  y=(f*a/d-c)/(e*a/d-b);
 round(x,4);
 round(y,4);
if(x/1000== -0.000) x=0.000;
  printf("%.3f %.3f\n",x,y);
}

C++: #include<iostream>
#include<algorithm>
#include<complex>
#include<iomanip>
using namespace std;
int main(){
	double a,b,c,d,e,f;
	int t=90000;
	for(int i=t;i;i--){
		for(int j=i;j;j--){
			if(i+j==2)a=0.0;
		}
	}
	while(cin>>a){cin>>b>>c>>d>>e>>f;
		cout<<fixed<<setprecision(3)<<abs((c*e-b*f)/(a*e-b*d))<<" ";
		cout<<fixed<<setprecision(3)<<abs((c*d-a*f)/(b*d-a*e))<<endl;
	}
	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 y = (a*f-d*c)/(-d*b+a*e);
		double x = (c-b*y)/a;
		cout << fixed << setprecision(3) << x << " " << y << endl;
	}
	return 0;
}

C++: #include<bits/stdc++.h>
using namespace std;

const double EPS=1e-8;
typedef vector<double>vec;
typedef vector<vec>mat;

/// Ax=b
vec gauss_jordan(const mat& A,const vec& b){
    int n=A.size();
    mat B(n,vec(n+1));

    for(int i=0;i<n;i++)
        for(int j=0;j<n;j++)B[i][j]=A[i][j];

    for(int i=0;i<n;i++)B[i][n]=b[i];

    for(int i=0;i<n;i++){
        int pivot=i;
        for(int j=i+1;j<n;j++){
            if(abs(B[j][i])<abs(B[pivot][i]))pivot=j;
        }
        swap(B[i],B[pivot]);
        if(abs(B[i][i])<EPS)return vec();

        for(int j=i+1;j<=n;j++)B[i][j]/=B[i][i];
        for(int j=0;j<n;j++){
            if(i==j)continue;
            for(int k=i+1;k<=n;k++)B[j][k]-=B[j][i]*B[i][k];
        }
    }

    vec x(n);
    for(int i=0;i<n;i++)x[i]=B[i][n];
    return x;
}

int main(){
    mat A(2,vec(2));
    vec b(2);
    while(true){
        for(int i=0;i<2;i++){
            if(scanf("%lf%lf%lf",&A[i][0],&A[i][1],&b[i])==EOF)return 0;
        }

        vec x=gauss_jordan(A,b);
        if(x.size()<2)return 0;
        printf("%.3lf %.3lf\n",x[0],x[1]);
    }
    return 0;
}

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

int main(){

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