Question

05. Calcule o valor de x nas proporções abaixo:
a)
$\frac{x}{10} = \frac{6}{5}$

b)
$\frac{3}{15 } = \frac{x}{5}$

c)
$\frac{2}{x} = \frac{7}{14}$

d)
$\frac{4}{20} = \frac{6}{x}$
me ajudem !!​

Answer 1

Explicação passo-a-passo:

a)

$\sf \dfrac{x}{10}=\dfrac{6}{5}$

$\sf 5x=10\cdot6$

$\sf 5x=60$

$\sf x=\dfrac{60}{5}$

$\sf \red{x=12}$

b)

$\sf \dfrac{3}{15}=\dfrac{x}{5}$

$\sf 15x=3\cdot5$

$\sf 15x=15$

$\sf x=\dfrac{15}{15}$

$\sf \red{x=1}$

c)

$\sf \dfrac{2}{x}=\dfrac{7}{14}$

$\sf 7x=2\cdot14$

$\sf 7x=28$

$\sf x=\dfrac{28}{7}$

$\sf \red{x=4}$

d)

$\sf \dfrac{4}{20}=\dfrac{6}{x}$

$\sf 4x=20\cdot6$

$\sf 4x=120$

$\sf x=\dfrac{120}{4}$

$\sf \red{x=30}$