两个电阻的并联阻值

#include <iostream>

using namespace std;

int main()

{

int r,r1,r2;

cout<<"两个电阻的并联阻值";

cin>>r1>>r2;

r=1/(1/r1+1/r2);

cout<<"两个电阻的并联阻值"<<r<<endl;

return 0;

}