#include<bits/stdc++.h>
using namespace std;
int gcd(int a,int b)
{
a=abs(a);
b=abs(b);
if(a<b) swap(a,b);
if(b==0) return a;
return gcd(b,a-b);
}
struct PhanSo{
int x,y;
};
void nhap(PhanSo &a,PhanSo &b){
cin>>a.x>>a.y;
cin>>b.x>>b.y;
}
void tong(PhanSo a,PhanSo b)
{
PhanSo p;
p.x=a.x*b.y+a.y*b.x;
p.y=a.y*b.y;
int c=gcd(p.x,p.y);
p.x/=c;
p.y/=c;
cout<<p.x<<"/"<<p.y<<endl;
}
void hieu(PhanSo a,PhanSo b)
{
PhanSo p;
p.x=a.x*b.y-b.x*a.y;
p.y=a.y*b.y;
int c=gcd(p.x,p.y);
cout<<p.x/c<<"/"<<p.y/c<<endl;
}
void tich(PhanSo a,PhanSo b)
{
PhanSo p;
p.x=a.x*b.x;
p.y=a.y*b.y;
int c=gcd(p.x,p.y);
p.x/=c;
p.y/=c;
cout<<p.x<<"/"<<p.y<<endl;
}
void thuong(PhanSo a,PhanSo b)
{
PhanSo p;
p.x=a.x*b.y;
p.y=a.y*b.x;
int c=gcd(p.x,p.y);
p.x/=c;
p.y/=c;
cout<<p.x<<"/"<<p.y<<endl;
}
int main()
{
PhanSo a,b;
nhap(a,b);
tong(a,b);
hieu(a,b);
tich(a,b);
thuong(a,b);
}
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