#include <bits/stdc++.h>

#define _overload(_1,_2,_3,name,...) name
#define _rep(i,n) _range(i,0,n)
#define _range(i,a,b) for(int i=int(a);i<int(b);++i)
#define rep(...) _overload(__VA_ARGS__,_range,_rep,)(__VA_ARGS__)

#define _rrep(i,n) _rrange(i,n,0)
#define _rrange(i,a,b) for(int i=int(a)-1;i>=int(b);--i)
#define rrep(...) _overload(__VA_ARGS__,_rrange,_rrep,)(__VA_ARGS__)

#define _all(arg) begin(arg),end(arg)
#define uniq(arg) sort(_all(arg)),(arg).erase(unique(_all(arg)),end(arg))
#define getidx(ary,key) lower_bound(_all(ary),key)-begin(ary)
#define clr(a,b) memset((a),(b),sizeof(a))
#define bit(n) (1LL<<(n))
#define popcount(n) (__builtin_popcountll(n))

using namespace std;

template<class T>bool chmax(T &a, const T &b) { return (a<b)?(a=b,1):0;}
template<class T>bool chmin(T &a, const T &b) { return (b<a)?(a=b,1):0;}

using R=double;
const R eps=1e-9;

// Problem Specific Parameter:
int a[1000010];
int b[1000010];
R t[1000010];


inline R f(R x,int i){return pow(x,a[i])*pow(log(x),b[i])-t[i];}
inline R g(R x,int i){return pow(x,a[i]-1.0)*pow(log(x),b[i]-1.0)*(a[i]*log(x)+b[i]);}

int main(void){
	int m;
	scanf("%d",&m);
	rep(i,m) scanf("%d %d %lf",a+i,b+i,t+i);

	rep(i,m){
		R ans=10.0;
		if(a[i]==0){
			ans=exp(pow(t[i],1.0/b[i]));
		}else if(b[i]==0){
			ans=pow(t[i],1.0/a[i]);
		}else{
			R l=1.0,r=7.0;

			rep(hoge,5){
				R m=(l+r)/2.0;
				if(f(m,i)<0.0)
					l=m;
				else
					r=m;
			}

			ans=(l+r)/2.0;
			//printf("%.12f\n",ans);
			rep(hoge,10){
				R nxt=ans-f(ans,i)/g(ans,i);
				ans=nxt;
			}
		}
		printf("%.12f\n",ans);
	}
	return 0;
}
// n=e(t/n^a)^1/b