(3/5-4/5-1/3): 1 1/3•5+0,9:1,8

- 1 1/2.

Пошаговое объяснение:

(3/5-4/5-1/3): 1 1/3•5+0,9:1,8 = - 1 1/2.

1. 3/5-4/5-1/3 = 9/15 - 12/15 - 5/15 = - 8/15;

2. - 8/15 : 1 1/3 = - 8/15 ·3/4 = - (8·3)/(15·4) = - (2·1)/(5·1)  = - 2/5;

3. - 2/5 ·5 = - 2;

4. 0,9:1,8  = 9 : 18 = 1/2;

5. - 2 + 1/2 = - (2 - 1/2) = - 1 1/2.