(3 5/6 — 1 2/15) · 5/9 + ((1/20 + 0,24) · 8 1/3 — 1 1/6) · 2 = 4
1) 3 5/6 — 1 2/15 = 3 25/30 — 1 4/30 = 2 21/30 = 2 7/10
2) 2 7/10 · 5/9 = 27/10 · 5/9 = (3·1)/(2·1) = 3/2 = 1 1/2
3) 1/20 + 0,24 = 1/20 + 24/100 = 5/100 + 24/100 = 29/100
4) 29/100 · 8 1/3 = 29/100 · 25/3 = (29·1)/(4·3) = 29/12 = 2 5/12
5) 2 5/12 — 1 1/6 = 2 5/12 — 1 2/12 = 1 3/12 = 1 1/4
6) 1 1/4 · 2 = 5/4 · 2 = 5/2 = 2 1/2
7) 1 1/2 + 2 1/2 = 3 2/2 = 4
Ответ: 4.