Question

1-3/11=
1-13/40=
4-1 4/7

Answer 1

1-3/11=8/11
1-13/40=27/40
Последний непонятно

Answer 2

1-3/11=11/11-3/11=8/11
1-13/40=40/40-13/40=27/40
4-1?4/7