Răspuns:
A= 9×5 la puterea x- 5 la puterea x+1 + 5 la puterea x+2 =》
A= 9×5 la puterea x - 5 la puterea x × 5+5 la puterea x × 25 =》 A= 5 la puterea x ( 9-5 +25) =》 A= 5 la puterea x ×29
