б) 42 : (25 + 38) ⋅ (23 ⋅ 11) – (100 – 67) : 9 – (98 + 377) + 300 : (45678 – 371 ⋅ 123)
1) 25 + 38 = 63
2) 23 ⋅ 11 = 253
3) 42 : 63 = 2/3
4) 2/3 ⋅ 253 = 506/3
5) 100 – 67 = 33
6) 33 : 9 = 11/3
7) 98 + 377 = 475
8) 45678 – 371 ⋅ 123 = 45678 - 45633 = 45
9) 300 : 45 = 20/3
10) 506/3 - 11/3 = 495/3 = 165
11) 165 - 475 = -310
12) -310 + 20/3 = -910/3
Ответ: -910/3