Ответ:

[tex](1.42 + \frac{3.22}{0.8} ) + 6 \times 0.7 = \\ = 1.42 + 2.42 + 4.2 = \\ = 8.04[/tex]

(1,42-(3,22) : (-0,8) + (-6) * (-0,7)=9.645