Question

3 номера математика. Допоможіть

Answer 1

Ответ:

$- 4.81 - a = 3.5 \\ a = - 4.81 - 3.5 = - 8.31$

$5 \div \frac{1}{5} + 3 \div ( - 0.1) + 14 = \\ = 25 - 30 + 14 = 9$

$2 \frac{2}{3} \div ( - 3 \frac{1}{3} ) = x \div 3.5 \\ \frac{8}{3} \times ( - \frac{3}{10} ) \times 3.5 = x \\ x = - 0.8 \times 3.5 = - 2.8$

Answer 2

1) а

$- 4.81 - a =3 .5 \\ a = - 4.81 - 3.5 \\ a = - 8.31$

2) б

$5 \div \frac{1}{5} + 3 \div ( - 0.1) + 14 = 25 - 30 + 14 = 39 - 30 = 9$

3) -2,8

$2 \frac{2}{3} \div ( - 3 \frac{1}{3} ) = x \div 3.5 \\ x = \frac{ 2\frac{2}{3} \times 3 \frac{1}{2} }{ - 3 \frac{1}{3} } \\ x = - \frac{8 \times 7 \times 3}{3 \times 2 \times 10} \\ x = - \frac{2 \times 7}{5} \\ x = - \frac{14}{5} \\ x = - 2 \frac{4}{5} \\ x = - 2.8$