Question

Calcule x, sabendo que a // b // c

Answer 1

Bom dia!

Usando teorema de tales:
$\displaystyle{\dfrac{6}{x}=\dfrac{3+6}{6}}\\\displaystyle{\dfrac{6}{x}=\dfrac{9}{6}}\\\displaystyle{9x=36}\\\displaystyle{x=\dfrac{36}{9}}\\\displaystyle{\boxed{x=4}}$

Espero ter ajudado!