1.

1)5/8+2 17/24 = 15/24+2 17/24=2 32/24= 3 8/24=3 1/3

2) 3 1/3:2,5 = 10/3: 25/10 =  10/3*2/5=20/15=4/3=1 1/3

2.

1) 1,3+23/30= = 13/10+23/30=39/30+23/30=62/30=2 2/30= 2 1/15

2) 2 1/15+4/11 = 11/165 + 60/165=71/165

3) 71/165*110/401=(71*110)/(165*401) = (71*10)/(15*401) = 71*2/(3*401)= 142/1203