Question

stim că
$\frac{a}{b}$
=
$\frac{5}{12}$
determina raportul
$\frac{2a + 5b}{3a + 2b}$
​

Answer 1

$\frac{a}{b}= \frac{5}{12}\\a=\frac{5b}{12}$

$2a+5b=2*\frac{5b}{12} +5b=\frac{10b}{12}+ \frac{60b}{12} =\frac{70b}{12}$

$3a+2b=3*\frac{5b}{12} +2b=\frac{15b}{12}+\frac{24b}{12}=\frac{39b}{12}$