Question

Срочно дам 40 балов ​

Answer 1

Пошаговое объяснение:

5/18 + 4/81 + 7/18 + 5/81 =

(5/18 + 7/18) + (4/81 + 5/81) =

12/18 + 9/81 = 2/3 + 1/9 = 6/9 + 1/9 = 7/9

7/16 + 11/42 + 9/16 + 17/42 =

(7/16 + 9/16) + (11/42 + 17/42) =

16/16 + 28/42 = 1 + 2/3 = 1 2/3