Question

Dacă a/b=3/7 aflați 2a+b/3a+2b
Dau coroana

Answer 1

a=3b/7
(6b/7 + b)/(9b/7 + 2b) =
13b/7 • 7/23b =
13/23

Answer 2

$\frac{a}{b} = \frac{3}{7} \\ \\ a= \frac{3b}{7} \\ \\ \frac{2a+b}{3a+2b}= \frac{2* \frac{3b}{7}+b }{ 3*\frac{3b}{7} +2b} = \frac{ \frac{6b}{7}+b }{ \frac{9b}{7}+2b } = \frac{ \frac{6b+7b}{7} }{ \frac{9b+14b}{7} } = \frac{13b}{7}: \frac{25b}{7} = \frac{13b}{7} * \frac{7}{23b} = \frac{13}{23}$