Сделайте номер 870 871 дам 80 баллов

Ответ:

Пошаговое объяснение:

870.

1) x = 3/5 - 1/8

x = 24/40 - 5/40

x = 19/40

2) x = 5/12 - 1/3

x = 5/12 - 4/12

x = 1/12

3) x = 1/5 + 3/20

x = 4/20 + 3/20

x = 7/20

4) x = 4/21 + 3/7

x = 4/21 + 9/21

x = 13/21

5) x = 4/5 - 1/6

x = 24/30 - 5/30

x = 19/30

6) x = 5/8 - 1/3

x = 15/24 - 8/24

x = 7/24

871.

1) 8/18 - 8/27 = 24/54 - 16/54 = 8/54 = 4/27

2) 7/16 - 5/24 = 21/48 - 10/48 = 11/48

3) 2/11 - 1/12 = 24/132 - 11/132 = 13/132

4) 12/13 - 15/26 = 24/26 - 15/26 = 9/26

5) 9/28 - 11/35 = 45/140 - 44/140 = 1/140

6) 39/40 - 19/28 = 273/280 - 190/280 = 83/280