Question

urgent!!!calculati valoarea expresiei : 3m+4n/4n,daca m/n=2,4

Answer 1

daca m/n = 2,4    m = 2,4n
(3m+4n)/4n = (7,2n+4n)/4n = 11,2n/4n = 2,8
daca m/n = 2·4    m = 8n  
(3m+4n)/4n =( 24n+4n)/4n = 7
daca m/n = 2/4     m = 2n/4 = n/2      (3m +4n)/4n = (3n/2 +4n)/4n= 11n/2 ·1/4n =
= 11/8
a/b = 5 ⇒ a = 5b    ⇒  5b/(5b-2a) = 5b/(5b -10b) = - 1