Question

32)Calcule o valor de x nas proporções. ​

Answer 1

Resposta:

$a) \: \frac{6}{x} = \frac{9}{12} \\ \\ 9x = 72 \div (9) \\ x = 8$

$b) \: \frac{2x}{3} = \frac{ - 24}{15} \\ \\ 30x = - 72 \\ \\ x = - \frac{72}{30} \div (2) \\ \\ x = - \frac{36}{15}$

$c) \: \frac{3}{4} = \frac{5x}{20} \\ \\ 20x = 60 \div (20) \\ x = 3$

$d) \: \frac{x + 5}{3} = \frac{x - 1}{5} \\ \\ 5 \times (x + 5) = 3 \times (x - 1) \\ 5x + 25 = 3x - 3 \\ 5x + 25 - 3x + 3 = 0 \\ 2x + 28 = 0 \\ 2x = - 28 \div (2) \\ x = - 14$