1.3
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#include <iostream>
#include <math.h>
using namespace std;
int a, b, c, d;
double x;
int main() {
cout << "Введите A B C D"<<endl;
cin >> a>>b>>c>>d;
if (a==0 or d==0)
{
cout<<"\nError";
}
else
{
x = (a*d + b*c)/(a*d);
cout <<x;
}
return 0;
}
Cpp
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