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11 lines
175 B
11 lines
175 B
2 years ago
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#include <bits/stdc++.h>
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using namespace std;
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int main() {
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float r1, r2;
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cin >> r1 >> r2;
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printf("%.2f", 1.0 / (1.0 / r1 + 1.0 / r2));
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return 0;
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}
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