b) a = (3² × 3⁹ + 3 × 3⁹ + 3⁹) : 39 =
= 13 × 3⁹ : 39 =
= 3⁹ : 3 =
= 3⁸ = (3⁴)² = p.p.
a) a = 2018 + 2 × (1 + 2017) × 2017 : 2 =
= 2018 + 2 × 2018 × 2017 : 2 =
= 2018 + 2018 × 2017 =
= 2018 × 2018 =
= 2018²
