6 3/11 = (116+3)/11 = 69/11 ≈ 6.271 8/11 = (111+8)/11 = 19/11 ≈ 1.737 2/5 = (5*7+2)/5 = 37/5 = 7.4
20 ÷ (6.27 + 1.73) + (7.4 - 5.8) ÷ 5= 20 ÷ 8 + 1.6 ÷ 5= 2.5 + 0.32= 2.82
Ответ: 2.82
6 3/11 = (116+3)/11 = 69/11 ≈ 6.27
1 8/11 = (111+8)/11 = 19/11 ≈ 1.73
7 2/5 = (5*7+2)/5 = 37/5 = 7.4
20 ÷ (6.27 + 1.73) + (7.4 - 5.8) ÷ 5
= 20 ÷ 8 + 1.6 ÷ 5
= 2.5 + 0.32
= 2.82
Ответ: 2.82