1) В

[tex]0.7 \times ( - 8) = - 5.6[/tex]

2) Б

[tex] - 0.54 \div ( - 1.8) = - 5.4 \div ( - 18) = 0.3[/tex]

3) 4ab

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

4) Г Б

[tex] - 8x + 23x - x = 23x - 9x = 14x = 14 \times ( - \frac{3}{14} ) = - 3[/tex]

[tex] \frac{3}{4} x \times ( - \frac{2}{17} ) = - \frac{3 \times 2}{4 \times 17} x = - \frac{3}{2 \times 17} x = - \frac{3}{34} x = - \frac{3}{34} \times ( - 34) = 3[/tex]

5) -7

[tex] - 6.2 \times 2 \frac{3}{14} + 2 \frac{3}{14} \times ( - 1.8) - 8 \times ( - 1 \frac{19}{56} ) = 2 \frac{3}{14} \times ( - 6.2 - 1.8) - 8 \times ( - 1 \frac{19}{56} )= 2 \frac{3}{14} \times ( - 8) - 8 \times ( - 1 \frac{19}{56} ) = - 8 \times (2 \frac{3}{14 } - 1 \frac{19}{56} ) = - 8 \times (2 \frac{12}{56} - 1 \frac{19}{56} ) = - 8 \times (1 \frac{68}{56} - 1 \frac{19}{56} ) = - 8 \times \frac{49}{56} = - \frac{8 \times 49}{56} = - 7[/tex]