2/5 : 1 3/5=2/5 : 8/5=2/5 * 5/8=2/8=1/4
1/4: 1 3/8=1/4: 11/8=1/4* 8/11=2/11
2/11: 1 3/11= 2/11: 14/11=2/11* 11/14=2/14=1/7
ответ:1/7
2/5 : 1 3/5=2/5 : 8/5=2/5 * 5/8=2/8=1/4
1/4: 1 3/8=1/4: 11/8=1/4* 8/11=2/11
2/11: 1 3/11= 2/11: 14/11=2/11* 11/14=2/14=1/7
ответ:1/7