Question

Daca a supra b = 2 supra 5 atunci 7a-2b supra 4a+3b=........

Answer 1

$a= \frac{2b}{5} \\ \frac{7a-2b}{4a+3b} = \frac{7* \frac{2b}{5} -2b}{4* \frac{2b}{5}+3b } = \frac{ \frac{14b-10b}{5} }{ \frac{8b+15b}{5} } =\frac{4b}{5}* \frac{5}{23b} = \frac{4}{23}$