Question

AJUTOR!!
Cate perechi de numere nenule (a, b) respecta conditia 1/a+2/b € |N ?
A) 2 B) 3 C) 4 D) 5 E) o infinitate

Answer 1

a=1 si b=1 ⇒1/1+2/1=1+2=3
a=1 si b=2 ⇒ 1/1+2/2=1+1=2
a=2 si b=4⇒ 1/2+2/4=1/2+1/2+1
a=3 si b=3⇒ 1/3+2/3=3/3=1

(a;b)∈ {(1;1) ;(1;2);(2;4) ; (3;3)}