Abc+cba=875+578, где получаем
a=8, b=7, c=5, значит
(a+c)*b=(8+5)*7=13*7=91
80.000-(5.308-906)=80.000-4.402= 75.598
S1 = 10×15 = 150
S2 = 7×4 = 28
S3 = 6×4 = 24
S4 = 7×(14-4) = 70
S5 = 4×4 = 16 = S6
S = S1 + S2 + S3 + S4 - S5 - S6 = 150 + 28 + 24 + 70 - 16 - 16 = 240
ответ: 240