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11 lines
188 B
C++
11 lines
188 B
C++
#include <bits/stdc++.h>
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using namespace std;
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int main() {
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double r1, r2;
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cin >> r1 >> r2;
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cout << fixed << setprecision(2) << 1 / (1 / r1 + 1 / r2) << endl;
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return 0;
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}
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