Question

решите пожалуйста 5-6​

Answer 1

Ответ:

5.

$\frac{1 - 2x}{3} - \frac{x + 3}{4} = \frac{2 - 4x}{5} \\ \frac{(1 - 2x) \times 20 - (x + 3) \times 15}{60} = \frac{(2 - 4x) \times 12}{60} \\ 20 - 40x - 15x - 45 = 24 - 48x \\ - 25 - 55x = 24 - 48x \\ - 55x + 48x = 24 + 25 \\ - 7x = 49 \\ x = 49 \div ( - 7) \\ x = - 7$

Сделаем проверку

$\frac{1 - 2 \times ( - 7)}{3} - \frac{( - 7) + 3}{4} = \frac{2 - 4 \times ( - 7)}{5} \\ \frac{1 + 14}{3} - \frac{ - 4}{4} = \frac{2 + 28}{5} \\ 5 + 1 = 6 \\ 6 = 6$

Ответ: x = -7

6.

$(1 \frac{3}{5} + 154.66 \div 70.3) \div ( - 1.9) + ( - 0.3) \times 10 = - 5 \\ 1)154.66 \div 70.3 = \frac{15466}{100} \div \frac{703}{10} = \\ \frac{15466}{100} \times \frac{10}{703} = \frac{22}{10} \\ 2)1 \frac{3}{5} + \frac{22}{10} = \frac{5 \times 1 + 3}{5} + \frac{22}{10} = \frac{8}{5} + \frac{22}{10} = \\ \frac{8 \times 2 + 22}{10} = \frac{16 + 22}{10} = \frac{38}{10} \\ 3) \frac{38}{10} \div ( - 1.9) = \frac{38}{10} \div ( - \frac{19}{10} ) = \frac{38}{10} \times ( - \frac{10}{19} ) = - 2 \\ 4)( - 0.3) \times 10 = - 3 \\ 5) - 2 + ( - 3) = - 2 - 3 = - 5$

Ответ: - 5