a) 375 ⋅ 0 + 294 : 294 – (16 – 16) : 2 = 375 ⋅ 0 + 294 : 294 – 0 : 2 = 0 + 1 - 0 = 1
б) 7 : (15 : 15) – (21 – 21) ⋅ 5 + 1 ⋅ 9 = 7 : 1 - 0 ⋅ 5 + 1 ⋅ 9 = 7 - 0 + 9 = 16
Ответ: a) 1; б) 16