Question

Daca a supra 3 = b supra 5, atunci raportul 5a+4b supra 4a-b are valoarea..

Answer 1

a/3=b/5=>a=3b/5

(5a+4b)/(4a-b)=
(5*3b/5+4b)/(4*3b/5-b)=
(3b+4b)/(12b/5-5b/5)=
7b/(7b/5)=
7b*5/7b=5

=>(5a+4b)/(4a-b)=5