Question

помогите пожалуйста ​

Answer 1

Ответ:

Пошаговое объяснение:

a) (1/5 + 1/6 + 3/8) : 15/16 = 1 1/45

1) 1/5 + 1/6 + 3/8 = 10/24 + 4/24 + 9/24 = 23/24

2) 23/24 : 15/16 = 23/24 * 16/15 = 23/6 * 4/15 = 92/90 = 1 2/90 = 1 1/45

б) 5 : 1 1/4 + 7 : 1 1/3 = 5 : 5/4 + 7 : 4/3 = 5 * 4/5 + 7 * 3/4 =

= 4 + 21/4 = 4 + 5 1/4 = 9 1/4

в) (6/21 + 1/7 - 5/14) : (5/18 - 1/9 + 3/6) = 3/26

1) 6/21 + 1/7 - 5/14 = 12/42 + 6/42 - 15/42 = 4/42 = 1/13

2) 5/18 - 1/9 + 3/6 = 5/18 - 2/18 + 9/18 = 12/18 = 2/3

3) 1/13 : 2/3 = 1/13 * 3/2 = 3/26

г) 77 : 11/12 - 19 : 2 3/8 = 77 * 12/11 - 19 : 19/8 = 84 - 19 * 8/19 =

= 84 - 8 = 76