Question

Determine o valor de x, nos feiches de retas abaixo: A) B)

Answer 1

Resposta:

a)

$\sf \dfrac{2}{4} = \dfrac{3}{x}$

$\sf \dfrac{2 \div 2}{4 \div 2} = \dfrac{3}{x}$

$\sf \dfrac{1}{2} = \dfrac{3}{x}$

$\sf x = 2 \times 3$

$\framebox {\sf x = 6 } \quad \longleftarrow \mathbf{ Resposta }$

$\sf \dfrac{4}{12} = \dfrac{x}{21} \quad \longleftarrow \mbox{ \sf Simplicar a fra{\c c}{\~a}o} 4/12.}$

$\sf \dfrac{4 \div 4}{12 \div 4} = \dfrac{x}{21}$

$\sf \dfrac{1}{3} = \dfrac{x}{21}$

$\sf 3x = 21$

$\sf x = \dfrac{21}{3}$

$\framebox { \sf x = 7 } \quad \longleftarrow \mathbf{ Resposta }$

Explicação passo-a-passo: