Question

решите пожалуйста эхххх

Answer 1

5ab/a(5b-8a)=5b/(5b-8a)

Answer 2

$\frac{5ab}{5ab-8a^2} = \frac{5ab}{a(5b-8a)} = \frac{5b}{5b-8a}$
$\frac{5*8}{5*8-8*3}= \frac{40}{40-24} = \frac{40}{16} =2.5$