Ответ:

1) [tex] - 4 \times b + 3 = - 4 \times \frac{3}{8} + 3 = 1.5[/tex]

2) [tex]6.4 \times b + 3 = 6.4 \times \frac{3}{8} + 3 = 5.4[/tex]

3) [tex] - 36 \times b + 3 = - 36 \times \frac{3}{8} + 3 = - 10.5[/tex]

4) [tex]- \frac{16}{15} \times b + 3 = -\frac{16}{15} \times \frac{3}{8} + 3 = 2.6 [/tex]

Пошаговое объяснение:

1) [tex] - 4 \times \frac{3}{8} = - \frac{4}{1} \times \frac{3}{8} = - \frac{3}{2} = - 1\frac{1}{2} = - 1.5[/tex]

[tex] - 1.5 + 3 = 1.5[/tex]

2) [tex]6.4 \times \frac{3}{8} = 6 \frac{4}{10} \times \frac{3}{8} = \frac{64}{10} \times \frac{3}{8} = \frac{32}{5} \times \frac{3}{8} = \frac{12}{5} = 2.4[/tex]

[tex]2.4 + 3 = 5.4[/tex]

3) [tex] - 36 \times \frac{3}{8} = - \frac{36}{1} \times \frac{3}{8} = - \frac{27}{2} = - 13 \frac{1}{2} = - 13.5[/tex]

[tex] - 13.5 + 3 = - 10.5[/tex]

4) [tex] - \frac{16}{15} \times \frac{3}{8} = - \frac{2}{5} = - 0.4[/tex]

[tex] - 0.4 + 3 = 2.6[/tex]