a)
[tex]5 \times 8 - \frac{1}{2} \times 8 = \\ = 40 - 4 = \\ = 36[/tex]
b)
[tex]2 \times ( - 4 {)}^{2} + 3( - 4) = \\ = 2 \times 16 - 12 = \\ = 32 - 12 = \\ = 20[/tex]
c)
[tex](2 \times 2 + 4( - 3))(5 - 2) = \\ = (4 - 12) \times 3 = \\ = 12 - 36 = \\ = - 24[/tex]
