помогите пожалуйста!​

Ответ:

2 1/7

Объяснение:

( 1,5 - 12/35 : 2/5 ) * (1 13/21 +1 5/7) = 2 1/7

1) 12/35 : 2/5 = 12/35 * 5/2=6/7

2) 1,5 - 6/7 = 1 5/10 - 6/7 = 1 1/2 - 6/7 = 3/2 -6/7 = (3*7)/14 - (6*2)/14= (21-12)/14 = 9/14

3) 1 13/21 + 1 5/7 = 1 13/21 + 1 (5*3)/21= 1 13/21 + 1 15/21 = 2 28/21 = 3 7/21 = 3 1/3

4) 9/14 * 3 1/3 = 9/14 * 10/3 = (3*5)/7= 15/7= 2 1/7