1015：计算并联电阻的阻值

louyuxiang

[C++] 纯文本查看 复制代码

#include<stdio.h>
using namespace std;
int main(){
	float r1,r2,R,a,b,c;
	scanf("%f %f",&r1,&r2);
	a=1/r1;
	b=1/r2;
	c=a+b;
	R=1/c;
	printf("%0.2lf",R);