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#include <iostream>
using namespace std;
int main(){
int a, b, c, d;
cin >> a >> b >> c >> d;
cout << “判断:” << a << “:” << b << “=” << c << “:” << d << endl;
if (a / b == c / d&&a*d == b * c) {
cout << “True” << endl;
return 0;
}
cout << “false”<<endl;
}