1) 11,9- 1 4/5×1 1/3
2) 16 1/2 : 11 + 9 1/6
3) (83,2 - 80 1/6 × 3/13
4) (0,28 + 1 1/3) : 11/30​.

Пошаговое объяснение:

1)11,9-154/15=11,9-10 4/15 = 1,9 - 4/15 = 1 9/10 - 4/15 = 1 18/30 + 8/30 = 1 26/30 = 1 13/15

2)16/2 :11 +9 1/6=1 1/2 + 9 1/6 = 1 1/2 + 55/6 = 1 3/6 + 55/6 = 1+ 58/6 =10 2/3

3)(83,2-80 1/6) *3 /13 =(83 2/10 - 80 1/6) * 3/13 = (83 6/30 - 80 5/30) * 3/13 = 3 1/30 * 3/13 = 91/30 * 3/13 = 91/10 * 1/13 = 91/130

4)(0,28+1.1/3):11/30=(0,28+1,33):0,37=1,61:0,37=4,35=4,4