Ответ:
а)
\(623 - 518.2 = 104.8\);
\(0.55 \cdot 104.8 = 57.64\);
\(1.24 \cdot 68 = 84.32\).
\(57.64 + 84.32 - 1.96 = 140\).
Ответ: 140.
б)
\(88.74 - 18.54 = 70.2\);
\(70.2 \cdot 0.009 = 0.6318\);
\(0.6318 - 0.6218 = 0.01\);
\(0.01 \cdot 400 = 4\).
Ответ: 4.
