(3 3/4*3/5-7 1/2:27+ 1 2/9) :(3 1/6-1 1/4)

Пошаговое объяснение:

на фото

(3 3/4 * 3/5 - 7 1/2 : 27 + 1 2/9) : (3 1/6 - 1 1/4) = 1 2/3,

1) 3 3/4 * 3/5 = 15/4 * 3/5 = 9/4 = 2 1/4,

2) 7 1/2 : 27 = 15/2 * 1/27 = 5/18,

3) 2 1/4 - 5/18 + 1 2/9 = 9/4 - 5/18 + 11/9 = 81/36 - 10/36 + 44/36 =

   = 115/36 = 3 7/36,

4) 3 1/6 - 1 1/4 = 3 2/12 - 1 3/12 = 2 14/12 - 1 3/12 = 1 11/12,

5) 3 7/36 : 1 11/12 = 115/36 : 23/12 = 115/36 * 12/23 = 5/3 = 1 2/3