1.4
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#include <iostream>
#include <math.h>
using namespace std;
int x1, x2, x3;
double y;
int main() {
cout << "Введите X1, X2, X3"<<endl;
cin>> x1 >> x2 >> x3;
y = x1*x2 + x1*x3 + x2*x3;
cout << y;
return 0;
}
Cpp
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