\( 28.3 + (-1.8 + 6) - (18.2 - 11.7) = 28.3 - 1.8 + 6 - 18.2 + 11.7 = 26.5 + 6 - 18.2 + 11.7 = 32.5 - 18.2 + 11.7 = 14.3 + 11.7 = 26 \)
\( -\frac{5}{8}(-3.62) - 1.18 \cdot \frac{5}{8} = \frac{5}{8} (-(-3.62) - 1.18) = \frac{5}{8} (3.62 - 1.18) = \frac{5}{8} (2.44) = 5 \cdot 0.305 = 1.525 \)
Ответ: а) 26; б) 1.525.