a) 3² x 5 + 3² x 7 = 3² x ( 5 + 7 ) = 9 x 12 = 108
b) 2025²⁰¹⁹ - 2024 x 2025²⁰¹⁸ = 2025²⁰¹⁸ x ( 2025 - 2024 ) = 2025²⁰¹⁸
c) ( 7¹⁰ x 7⁹ ) : ( 7⁹ - 7⁸ ) = 7¹⁹ : 7⁸ x ( 7 - 1 ) = 7¹¹ / 6
d) 5³ x 2⁶ - 5³ x 7² = 5³ x ( 2⁶ - 7² ) = 125 x ( 64 - 49 ) = 125 x 15 = 1 875