Question

CALCULE O VALOR DE X NAS PROPORÇOES:

A)X-2/12=X/20

H)3/2=X+3/X-1

VLW < 3

Answer 1

Resposta:

a) x = 5

b) x= 9

Explicação passo-a-passo:

Letra A

$\dfrac{X-2}{12}=\dfrac{X}{20}$

$12X = 20(X-2)$

$12X=20X-40$

$12X-20X=-40$

$-8X=-40$

$X=\dfrac{-40}{-8}\rightarrow x=5$

Letra B

$\dfrac{3}{2} =\dfrac{X+3}{X-1}$

$2(X+3)=3(X-1)$

$2X+6=3X-3$

$2X-3X=-3-6$

$-X=-9$ Multiplicar ×(-1)

$\rightarrow X=9$