b) B= 4,75+ (-1/2)^ 3+ 0,5 ^2- 3. -3/8

b) $B=4,75+{\left(\frac{-1}{2}\right)}^3+0,5^2-3.\frac{-3}{8}$

$=4,75-\frac{1}{8}+0,25-\frac{-9}{8}$

$=\left(4,75+0,25\right)+\left(\frac{-1}{8}+\frac{9}{8}\right)$

= 5 + 1

= 6.