11/11=12/12=13/13=1
11/13<11/12<12/13<13/12<12/11<13/11</p>
11/13<11/12 (11*12<11*13)</p>
11/12<12/13 (11*13<12*12)</p>
12/13<12/11 (12*11<12*13)</p>
13/12<12/11 (13*11<12*12)</p>
12/11<13/11 (12*11<13*11)</p>
Ответ:11/13<11/12<12/13<13/12<12/11<13/11</p>