Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

func gcd(num1, num2 int) int {
	if num2 == 0 {
		return num1
	}
	num3 := num1 % num2
	return gcd(num2, num3)
}

func lcm(num1, num2 int) int {
	if num1%num2 != 0 {
		num3 := gcd(num1, num2)
		for i := 1; ; i++ {
			check := num3 * i
			if check%num1 == 0 && check%num2 == 0 {
				return check
			}
		}
	} else {
		return num1
	}
}

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	for scanner.Scan() {
		strNums := strings.Fields(scanner.Text())
		nums := []int{}
		for _, strNum := range strNums {
			num, _ := strconv.Atoi(strNum)
			nums = append(nums, num)
		}
		a := nums[0]
		b := nums[1]
		c := nums[2]
		d := nums[3]
		e := nums[4]
		f := nums[5]
		lcm := lcm(a, d)
		mulA := lcm / a
		mulD := lcm / d
		a *= mulA
		b *= mulA
		c *= mulA
		d *= mulD
		e *= mulD
		f *= mulD

		if d < 0 {
			d *= -1
			e *= -1
			f *= -1
		}

		bE := b - e
		cF := c - f
		if bE==0{
		    bE=1
		}
		y := cF / bE
		x := (c - (y * b)) / a

		
			fmt.Printf("%d.000 ", x)
			fmt.Printf("%d.000\n", y)
	}
}

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()
{
	int 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<stdio.h>
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=(e*c-b*f)/(e*a-b*d);
		y=(c-a*x)/b;
		printf("%0.3f %0.3f\n",x,y);
	}
}

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

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

	while (cin >> a >> b >> c >> d >> e >> f) {
		if (e * c == b * f)
			x = 0;
		else
			x = (e * c - b * f) / (a * e - b * d);

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

		cout << setiosflags(ios::fixed | ios::showpoint) << setprecision(3)
			<< x << " " << y << endl;
	}

	return 0;
}

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

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

C++: #include <iostream> 
#include <cstdio>
using namespace std;
const int n = 1000100;
double a[n], b[n], c[n], d[n], e[n], f[n], x[n], y[n]; 
int main () {
	int count = 1;
	while (cin >> a[count] >> b[count] >> c[count] >> d[count] >> e[count] >> f[count]) count++;

	for (int i = 1; i < count; i++) {
		x[i] = (c[i] * e[i] - b[i] * f[i]) / (a[i] * e[i] - b[i] * d[i]);
		y[i] = (a[i] * f[i] - c[i] * d[i]) / (a[i] * e[i] - b[i] * d[i]);
		x[i] = (int)(10000 * x[i] + 5) / 10000;
		y[i] = (int)(10000 * y[i] + 5) / 10000;
		printf ("%.3f %.3f\n", x[i], y[i]);
	}
	
	return 0;
}

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

int main(){
  for(double a1,b1,c1,d1,e1,f1,b2,c2,e2,f2,a3,c3,d3,f3,x,y;cin>>a1>>b1>>c1>>d1>>e1>>f1;){

    b2=b1*d1;
    c2=c1*d1;

    e2=a1*e1;
    f2=a1*f1;

    y=(c2-f2)/(b2-e2);

    a3=a1*e1;
    c3=c1*e1;

    d3=b1*d1;
    f3=b1*f1;

    x=(c3-f3)/(a3-d3);

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

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

using namespace std;

int main(){
        double a, b, c, d, e, f, g, h, i, j, k, l, m, n, x, y;

        while(scanf("%lf%lf%lf%lf%lf%lf", &a, &b, &c, &d, &e, &f) != EOF){
                g = a * d;      //公倍数
                j = b;
                k = c;
                l = a;
                b *= g / a;
                c *= g / a;
                e *= g / d;
                f *= g / d;
                a *= g / a;
                d *= g / d;

                h = b - e;
                i = c - f;

                y = i / h;
                x = k - y * j;
                x /= l;
                y *= 1000;
                y = floor(y + 0.5);
                y /= 1000;
                x *= 1000;
                x = floor(x + 0.5);
                x /= 1000;

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

        return 0;
}

C++: #include<iostream>
#include<stdio.h>
using namespace std;
int main(){
  int a,b,c,d,e,f;
  double x,y;
  while(cin>>a>>b>>c>>d>>e>>f)
    {
      x=1.0*(c*e-b*f)/(a*e-b*d)+0.0001;
	y=(c-a*x)/b+0.0001;
	printf("%.3f %.3f\n",x,y);
    }}

C++: #include<stdio.h>
int main(){
	double a,b,c,d,e,f;
	double x,y,z,v;
	while(scanf("%lf %lf %lf %lf %lf %lf",&a,&b,&c,&d,&e,&f)!=-1)
	x=(c*e-b*f)/(a*e-b*d);
	y=(c*d-a*f)/(b*d-a*e);
	if(x>=-0.0005&&x<0.0005)	x=0;
	if(y>=-0.0005&&y<0.0005)	y=0;
	printf("%.3lf %.3lf\n",x,y);
}
}

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

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[0]*a[4]-a[1]*a[3];
		double c=a[0];
		a[0]=a[4];
		a[4]=c;
		a[1]*=-1.0;
		a[3]*=-1.0;
		x=(a[0]*a[2]+a[1]*a[5])/b;
		y=(a[3]*a[2]+a[4]*a[5])/b;
		if(x==-0.0)x=0.0;
		if(y==-0.0)y=0.0;
		printf("%.3f %.3f\n",x,y);
	}
	


	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 <iostream>
#include <iomanip>
using namespace std;

int main() {
	int a[200], b[200], c[200], d[200], e[200], f[200];
	double x[200], y[200];

	int i = 0;
	while(cin >> a[i] >> b[i] >> c[i] >> d[i] >> e[i] >> f[i]) {
		if(a[i] != 0 && b[i] != 0 && d[i] != 0 && e[i] != 0) {
			x[i] = (b[i]*f[i]-e[i]*c[i])/(b[i]*d[i]-a[i]*e[i]);
			y[i] = (d[i]*c[i]-a[i]*f[i])/(b[i]*d[i]-a[i]*e[i]);
		} else {
			if(a[i] == 0) {
				y[i] = c[i]/b[i];
				x[i] = (f[i]-e[i]*y[i])/d[i];
			} else if(b[i] == 0) {
				x[i] = c[i]/a[i];
				y[i] = (f[i]-d[i]*x[i])/e[i];
			} else if(d[i] == 0) {
				y[i] = f[i]/e[i];
				x[i] = (c[i]-b[i]*y[i])/a[i];
			} else if(e[i] == 0) {
				x[i] = f[i]/d[i];
				y[i] = (c[i]-a[i]*x[i])/b[i];
			}
		}
		i++;
	}

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

	return 0;
}

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

using namespace std;

int main() {

	double ans[4], coe[12];
	int i;

	for (i = 0; i < 12; i++) 
		cin >> coe[i];
	ans[0] = (coe[2] * coe[4] - coe[1] * coe[5]) / (coe[0] * coe[4] - coe[1] * coe[3]);
	ans[1] = (coe[2] * coe[3] - coe[0] * coe[5]) / (coe[1] * coe[3] - coe[0] * coe[4]);
	ans[2] = (coe[8] * coe[10] - coe[7] * coe[11]) / (coe[6] * coe[10] - coe[7] * coe[9]);
	ans[3] = (coe[8] * coe[9] - coe[6] * coe[11]) / (coe[7] * coe[9] - coe[6] * coe[10]);
	
	printf("%.3f %.3f\n", ans[0], ans[1]);
	printf("%.3f %.3f\n", ans[2], ans[3]);

	return 0;

}