Question

Допоможіть будь ласка зробити д\з

Answer 1

1) В

$0.7 \times ( - 8) = - 5.6$

2) Б

$- 0.54 \div ( - 1.8) = - 5.4 \div ( - 18) = 0.3$

3) 4ab

$- \frac{2}{3} a \times ( - 6b )= \frac{2 \times 6}{3} ab = 4ab$

4) Г Б

$- 8x + 23x - x = 23x - 9x = 14x = 14 \times ( - \frac{3}{14} ) = - 3$

$\frac{3}{4} x \times ( - \frac{2}{17} ) = - \frac{3 \times 2}{4 \times 17} x = - \frac{3}{2 \times 17} x = - \frac{3}{34} x = - \frac{3}{34} \times ( - 34) = 3$

5) -7

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