Question

Решите только последние 4 уровнения!!!!!!!
За рание спасибо)))

Answer 1

в)

$\frac{x + 7}{3} = \frac{2x - 3}{5} \\ 3(2x - 3) = 5(x + 7) \\ 6x - 9 = 5x + 35 \\ 6x - 5x =3 5 + 9 \\ x = 44$

г)

$\frac{0.2}{x + 3} = \frac{0.7}{x - 2} \\ 0.7(x + 3) = 0.2(x - 2) \\ 0.7x + 2.1 = 0.2x - 0.4 \\ 0.7x - 0.2x = - 0.4 - 2.1 \\ 0.5x = - 2.5 \\ x = - 2.5 \div 0.5 \\ x = - 5$

ж)

$- 4 \times ( - z + 7) = z + 17 \\ 4z - 28 - z = 17 \\ 3z = 17 + 28 \\ 3z = 45 \\ z = 45 \div 3 \\ z = 15$

з)

$c - 32 = (c + 8) \times ( - 7) \\ c = - 7c - 56 + 32 \\ c + 7c = - 24 \\ 8c = - 24 \\ c = - 24 \div 8 \\ c = - 3$