а) (−5 + 12) ⋅ (−11 + 7) = 7 ⋅ (−4) = −28
б) −8 ⋅ (−5) − (−28) : 7 = 40 − (−4) = 40 + 4 = 44
в) (8 − 11) : (−15) = (−3) : (−15) = 0,2
г) −5 ⋅ (−8) − 7 = 40 − 7 = 33
Ответ: -28; 44; 0,2; 33