Răspuns :
(3^7×5^9)^2 : (3^12×5^17) =
= (3^7)^2 × (5^9)^2 : (3^12 × 5^17) =
= (3^14 × 5^18 ) : (3^12 × 5^17) =
= 3^14 : 3^12 × 5^18 : 5^17 =
= 3^2 × 5^1 =
= 9 × 5 =
= 45
= (3^7)^2 × (5^9)^2 : (3^12 × 5^17) =
= (3^14 × 5^18 ) : (3^12 × 5^17) =
= 3^14 : 3^12 × 5^18 : 5^17 =
= 3^2 × 5^1 =
= 9 × 5 =
= 45