(1/3+2/5)×1целая 4/11-1,8

Question

(1/3+2/5)×1целая 4/11-1,8

Answer 1

1) 1/3  +  2/5 =5/15  +  6/15 =  11/15
2) 11/15  ×  1 4/11 = 11/15  ×  15/11 =  1
3) 1 - 1,8 =  - 0,8