1) 1 1/35: 4/5= 36/35*5/4=9/7

2) 9/7- 1 8/35=45/35-43/35=2/35

3) 2/35*3 1/3=2/35*10/3=20/105=4/21

Ответ:

4/21

Пошаговое объяснение:

1) 1 1/35 : 4/5=

= (1*35+1)/35 : 4/5 = 36/35 : 4/5=

= 36/35 * 5/4 = (36*5) / (35*4)=

=(9*4*5) / (5*7*4) = 9/7 = 1 2/7

2) 1 1/35 : 4/5 - 1 8/35 =

= (1) - 1 8/35 =

= 1 2/7 - 1 8/35 = (1-1) + (2/7-8/35)=

= 0 + (2*5/7*5 - 8/35)=

=10/35-8/35 = 2/35

3) ( 1 1/35 : 4/5 - 1 8/35 ) * 3 1/3 =

= (2) * 3 1/3 =

= 2/35 * (3*3+1)/3=

= 2/35 * 10/3=

=(2*10) / (35*3)= (2*2*5) / (5*7*3) =

= (2*2)/(7*3)= 4/21