#include<stdio.h>
#include<math.h>

int a,b;

double result(double x){
	return pow(x,(double)a)*pow(log(x),(double)b);
}

int main(){
	long m,i;
	double time,s,e,dif;
	scanf("%ld",&m);
	for(i=0;i<m;i++){
		scanf("%d %d %lf",&a,&b,&time);
		s=0.0;
		e=22027.0;
		dif=time-result((s+e)/2.0);
		while(dif>0.0000000001 || dif<-0.0000000001){
			if(dif>0){
				s=(s+e)/2.0;
			}else{
				e=(s+e)/2.0;
			}
			dif=time-result((s+e)/2.0);
		}
		printf("%.10f\n",(e+s)/2.0);
	}
	return 0;
}