package arupsClassFinalTeam;

import java.util.Scanner;

public class SoccerDavidSol {

	public static void main(String[] args) {
		Scanner fs=new Scanner(System.in);
		int T=fs.nextInt();
		for (int tt=0; tt<T; tt++) {
			int n=fs.nextInt(), k=fs.nextInt(), r=fs.nextInt();
			int rr=Math.min(n, k+r);
			int ll=Math.max(0, k-r);
			int size=rr-ll, gcd=gcd(size, 2*r);
			System.out.println(size/gcd+"/"+(2*r/gcd));
		}
	
	}
	
	static int gcd(int a, int b) {
		return b==0?a:gcd(b, a%b);
	}

}