Verified answer

Ответ:

1) -1,6

2) 576

3)

[tex] - \frac{32}{27} a[/tex]

Пошаговое объяснение:

1)

[tex] - 1.2ab {}^{3} = - 0.4 \times 3ab {}^{3 = \\ = - 0.4 \times 4 } = \\ = - 1.6[/tex]

2)

[tex]27a {}^{3} b {}^{9} = \\ = 9 \times (3ab {}^{3} ) {}^{3} = \\ = 9 \times 4 {}^{3} = \\ = 9 \times 64 = 576[/tex]

3)

[tex] - \frac{2}{3} a {}^{3} b {}^{6} = \\ = - \frac{2}{3} a \times (ab {}^{3} ) {}^{2} = \\ = - \frac{2}{3} a \times ( \frac{4}{3} ) {}^{2} = \\ = - \frac{32}{27} a[/tex]