iramazurk

Ответ:

Пошаговое объяснение:

1.

1) 1/3 - 1/9 = 3/9 - 1/9 = 2/9

2) 18 * 2/9 = 2 * 2/1 = 4/1 = 4

3.

1) 1 - 1/3 - 1/6 - 1/9 =

18/18 - 6/18 - 3/18 - 2/18 =

(18-6-3-2)/18 = 7/18

2) 7/18 * 18 = 7/1 * 1 = 7/1 = 7