Question

ajudem a achar o valor de x por favor ?​

Answer 1

Explicação passo-a-passo:

a)

$\sf \dfrac{7}{8}=\dfrac{x}{128}$

$\sf 8x=7\cdot128$

$\sf 8x=896$

$\sf x=\dfrac{896}{8}$

$\sf \red{x=112}$

b)

$\sf \dfrac{2}{8}=\dfrac{8}{x}$

$\sf 2x=8\cdot8$

$\sf 2x=64$

$\sf x=\dfrac{64}{2}$

$\sf \red{x=32}$

c)

$\sf \dfrac{x+2}{10}=\dfrac{8}{2}$

$\sf 2\cdot(x+2)=10\cdot8$

$\sf 2x+4=80$

$\sf 2x=80-4$

$\sf 2x=76$

$\sf x=\dfrac{76}{2}$

$\sf \red{x=38}$

d)

$\sf \dfrac{2}{x}=\dfrac{12}{6}$

$\sf 12x=2\cdot6$

$\sf 12x=12$

$\sf x=\dfrac{12}{12}$

$\sf \red{x=1}$