double a,b,t,s,n,x,y,z;q,m;
main(){for(scanf("%d",&m);m--;printf("%.10lf\n",s)){scanf("%lf%lf%lf",&a,&b,&t);!a?(s=exp(pow(t,1/b))):!b?(s=pow(t,1/a)):0;if(a&&b){n=1;x=pow(t,1/b);y=a/b;for(;!q;z=n-exp(x/pow(n,y)),(fabs(z)<10e-10?(s=n,q=1):(n-=z/4)));}}}