Question

na figura abaixo,temos que  a//b//c//.se a = 8,4,qual é o valor de x?

Answer 1

Teorema de Tales:

$\frac{a}{5.a} = \frac{x}{30}$

$\frac{8,4}{5.8,4} = \frac{x}{30}$


$\frac{8,4}{42} = \frac{x}{30}$

$42x = 30.8,4 42x = 252$


$x = \frac{252}{42}$


$x = 6$

Answer 2

$\\\frac{a^{\div a}}{5a^{\div a}}=\frac{x}{30}\\\\\frac{1}{5}=\frac{x}{30}\\\\5\cdot x=1\cdot30\\\\x=\frac{30}{5}\\\\\boxed{x=6}$