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已采纳
#include<iostream>
#include<cmath>
#include<cstdio>
using namespace std;
int main(){
double a,b,c,d;
cin>>a>>b;
c=a*b-16;
d=sqrt(c);
printf("%.1lf",int(d*10+0.5)/10.0);
return 0;
}
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