-2 + 9 + 3/17 - (4 + 2/11 + 3.1 - 3) - 5 9/11
= 7 + 3/17 - (4 + 2/11 + 3.1 - 3) - 66/11
= 7 + 3/17 - (4 + 2/11 + 0.9) - 66/11
= 7 + 3/17 - (4 + 0.181 + 0.9) - 66/11
= 7 + 3/17 - (4 + 1.081) - 66/11
= 7 + 3/17 - 5.081 - 66/11
= 7 + 0.176 - 5.081 - 6
= 1.176 - 5.081 - 6
= -3.905 - 6
= -9.905

Ответ: -9.905