Question

Calcule o valor de x nas expressões a seguir:

a) x-2/x = 12/20
b)0,6/2x = 0,9/6
c)x+1/x = 1/3
d)5/x+3 = 2/7,3

Answer 1

$\frac{x - 2}{x} = \frac{12}{20} \\ 20x - 40 = 12x \\ 8x = 40 \\ x = 5$
b)
$\frac{0.6}{2x} = \frac{0.9}{6} \\ 1.8x = 3.6 \\ x = 2$
c)
$\frac{x + 1}{x} = \frac{1}{3} \\ 3x + 3 = x \\ 2x = 3 \\ x = \frac{3}{2}$
d)
$\frac{5}{x + 3} = \frac{2}{7.3} \\ 2 x + 6 = 36.5 \\ x = \frac{30.5}{2} = 15.25$