Question

URGENTE!!!!!!
determine o valor de x nas proporções a seguir

a)x+5/x = 10/8
b)x-5/3 = x-1/4​

Answer 1

Explicação passo-a-passo:

a)

$\sf \dfrac{x+5}{x}=\dfrac{10}{8}$

$\sf 10x=8\cdot(x+5)$

$\sf 10x=8x+40$

$\sf 10x-8x=40$

$\sf 2x=40$

$\sf x=\dfrac{40}{2}$

$\sf \red{x=20}$

b)

$\sf \dfrac{x-5}{3}=\dfrac{x-1}{4}$

$\sf 4\cdot(x-5)=3\cdot(x-1)$

$\sf 4x-20=3x-3$

$\sf 4x-3x=-3+20$

$\sf \red{x=17}$