Question

stiind ca: a supra b =2 supra 7 calculati valoarea raportului 5 a b supra 3b-2a

Answer 1

a=$\frac{2b}{7}$
$\frac{5* \frac{2b}{7} *b}{3b-2* \frac{2b}{7} } = \frac{10b ^{2} }{7} * \frac{7}{17b} = \frac{10b}{17}$