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; }
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