nyoj 97 兄弟郊游问题

#include<iostream>#include<cstdio>using namespace std;int main(){int n;int m,x,y,z;scanf("%d",&n);while(n--){scanf("%d%d%d%d",&m,&x,&y,&z);printf("%.2f\n",m*x*1.0/(y-x)*z);}return 0;}