Question

Am nevoie de ajutor la acest ex

Answer 1

Răspuns:

$\red{ b : 2 : a = 20^{-1}}$

Explicație pas cu pas:

$a:b:2 = 5 \Rightarrow \dfrac{a}{b} : 2 = 5 \Rightarrow \dfrac{a}{b} \cdot \dfrac{1}{2} = 5$

$\dfrac{a}{b} \cdot \dfrac{1}{2} = 5 \Rightarrow \dfrac{a}{2b} = 5 \Rightarrow a = 10b$

$b:2:a = b:2:10b = \dfrac{b}{2} :10b$

$\dfrac{b}{2} \cdot \dfrac{1}{10b} = \dfrac{b}{20b}= \dfrac{1}{20} = 20^{-1}$