#include <iostream>

using namespace std;

int main()

{
    double R1,R2,R;

	cout<<"請輸入兩個電阻阻值R1，R2	:"<<endl;
    
    cin>>R1>>R2;
	
    R=R1*R2/(R1+R2);

	cout<<"R1,R2並聯後的阻值R:"<<R<<endl;

	return 0;
}

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