Question

Repede!..........................

Answer 1

Răspuns

a= 5¹²²+5¹²¹-5¹²⁰=5¹²⁰(5²+5-1)=5¹²⁰x29 ⇒ a este divizibil cu 29

Answer 2

$a = {5}^{122} + {5}^{121} - {5}^{120} \\ \\ a = {5}^{120} \times ( {5}^{2} + {5}^{1} - 1) \\ \\ a = {5}^{120} \times (25 + 5 - 1) \\ \\ a = {5}^{120} \times 29$