Răspuns:
a) (b × c) × a = 1
b) a-¹ : (b × c) = 1
Explicație pas cu pas:
a = - 125/8 ; b = 2/5 ; c = - 4/25
b) (b × c) × a = [2/5 × (- 4/25)] × ( - 125/8) = (- 8/125) × (- 125/8) = 1
c) a-¹ : ( b × c) = (- 125/8)-¹ : [2/5 × (- 4/25)] = - (125/8)-¹ : (- 8/125) = 8/125 : 8/125 = 1