Question

Se stie ca $\frac{a}{15} - \frac{b}{27} = \frac{1}{3}$
Calculati 9a-5b

Answer 1

$\it \dfrac{a}{15} -\dfrac{b}{27} = \dfrac{1}{3}|_{\cdot3} \Longrightarrow \dfrac{a}{ 5} -\dfrac{b}{ 9} = 1\ |_{\cdot45} \Longrightarrow 9a - 5b = 45$