Question

aflati x E N(x număr natural) pentru care a)2x-1|25 b)x+2|x+4

Answer 1

a) 2x-1/25⇒2x-1∈D25⇒2x-1∈{1;5;25} |+1⇒2x∈{2;6;26} |:2⇒x∈{1;3;13}             
b) Din x+2/x+4 si x+2/x+2 ⇒ x+2/[(x+4)-(x+2)] ⇒x+2/(x+4-x-2) ⇒ x+2/2 ⇒   x+2∈D2 ⇒X+2∈{1;2} |-2 ⇒ x∈{-1;0} ⇒x=0