102-(155,4:14,8+2,1)*3,5=
102-(155,4/14,8+2,1)*3,5 = 57,9
1- 155,4/14,8+2,1=12,6
2- 12.6*3.5=44,1
3- 102-44.1=57,9
1) 155.4 : 14.8 = 10.5
2) 10.5 + 2.1 = 12.6
3) 12.6 * 3.5 = 44.1
4) 102 - 44.1 = 57.9
ответ 57.9