Question

Determinati numerele de forma abc pentru care 3ab + ab3 = 534

Answer 1

3ab+ab3=534
321+213=534................

Answer 2

3ab+ab3=534
2(ab3)=534
a·b·3=534:2
a·b·3=267
a·b=267:3
a·b=89

(a;b)∈{(1;89) , (89;1)}     (89-numar prim)

=> a∈{1,89}
     b∈{89,1}