Question

resolva as seguintes proporções:​

Answer 1

Explicação passo-a-passo:

a)

$\sf \dfrac{x}{5}=\dfrac{21}{35}$

$\sf 35x=5\cdot21$

$\sf 35x=105$

$\sf x=\dfrac{105}{35}$

$\sf x=3$

b)

$\sf \dfrac{10}{7}=\dfrac{50}{x}$

$\sf 10x=7\cdot50$

$\sf 10x=350$

$\sf x=\dfrac{350}{10}$

$\sf x=35$

c)

$\sf \dfrac{0,9}{x}=\dfrac{-18}{27}$

$\sf -18x=0,9\cdot27$

$\sf -18x=24,3$

$\sf x=\dfrac{24,3}{-18}$

$\sf x=\dfrac{243}{-180}$

$\sf x=-1,35$