Question

me ajudemm pra agora por favoorrr

Answer 1

Resposta:

a)

$\dfrac{x}{18} = \dfrac{8}{12}$

12x = 8 . 18

12x = 144

x = 144/12

x = 12

b)

$\dfrac{10}{x} = \dfrac{20}{5}$

$20x = 10 \times 5\\\\20 x = 50\\\\x = \dfrac{50}{20} \\\\x = \dfrac{5}{2}$

c)

$\dfrac{4}{8} = \dfrac{2x + 1}{5x -\,1}$

$4\times (5x -\, 1) = 8 \times (2x + 1 )$

$20x -\, 4 = 16x + 8\\\\20x -\, 16x = 8 + 4\\4x = 12\\\\x = \dfrac{12}{4} \\\\x = 3$