2 1/5 : 1 1/5 - 1 1/4

2 1/5 : 11/5 - 11/4
= 11/5 × 5/11 - 11/4
= 1 - 11/4
= 4/4 - 11/4
= -7/4

2 1/5=11/5
1 1/5=6/5
1 1/4=5/4
jadi:
11/5:6/5-5/4
11/5x5/6-5/4
11/6-5/4=14/24
14:24:2/2=7/12
maaf kalau salah