Trebuie ajutor repede

Răspuns:
a) [(4/7)⁶]⁴: (4/7)¹³= (4/7)²⁴: (4/7)¹³= (4/7)¹¹
b) (3/7)⁴⁰: [ (3/7)³ × (3/7)⁵]²= (3/7)⁴⁰: [(3/7)⁸]²
=> (3/7)⁴⁰: (3/7)¹⁶= (3/7)²⁴