Question

Me ajudem nessas questões por favor

Answer 1

Explicação passo-a-passo:

$a) \\ \frac{15}{5} = \frac{20}{x} \\ 15x = 100 \\ x = \frac{100}{15} \\ x = 6.6$

$b) \\ \frac{x}{1} = \frac{3}{2} \\ 2x = 3 \\ x = \frac{3}{2}$

$c) \frac{4x + 1}{x + 2} = \frac{16}{18} \\ 18x + 18 = 16x + 32 \\ 18x - 16x = 32 - 18 \\ 2x = 14 \\ x = \frac{14}{2} \\ x = 7$

$d) \\ \frac{18}{x} = \frac{14}{21} \\ 14x = 378 \\ x = \frac{378}{14} \\ x = 27$

$e) \\ \frac{x}{14} = \frac{9}{12} \\ 12x = 126 \\ x = \frac{126}{12} \\ x = 10.5$

$f) \\ \frac{2x - 3}{3x + 1} = \frac{4}{7} \\ 14x - 21 = 12x + 4 \\ 14x - 12x = 21 + 4 \\ 2x = 25 \\ x = \frac{25}{2} \\ x = 12.5$