两军交锋

 1 #include <stdio.h> 
 2 
 3 int main(){
 4     int T;
 5     double u;
 6     double v;
 7     double w;
 8     double l;
 9     double result;
10 
11     scanf("%d",&T);
12 
13     while(T--){
14         scanf("%lf%lf%lf%lf",&u,&v,&w,&l);
15 
16         result=l/(u+v)*w;
17 
18         printf("%.3lf\n",result);
19     }
20     return 0;
21 }