#include<stdio.h>
int main()
{
    int i,x,y,tc;
    double div;

    scanf("%d",&tc);

    for(i=0;i<tc;i++){
        scanf("%d%d",&x,&y);

        if((x<0&&y==0)||(x==0&y==0)){
            printf("divisao impossivel\n");
        }
        else if(x==0&&y<0){
            div=(double)((x/y)*(-1));
            printf("%0.1lf\n",div);
        }
        else if(x>0&&y==0){
            printf("divisao impossivel\n");
        }
        else if(x==0&&y==0){
            printf("divisao impossivel\n");
        }

        else{
            div=(double)x/y;
            printf("%0.1lf\n",div);
        }
    }
    return 0;
}