Réponse :

Explications :

Bonjour,

e = √1280 = √(256 * 5) = √(16² * 5) = 16√5

d = √125 = √(5² * 5) = 5√5

c = 1/2 * √80 = 1/2 * √(16 * 5) = 4/2 * √5 = 2√5

b = 2 * √45  = 2 * √(9 * 5) = 2 * 3√5 = 6√5

a = √20 = √(4 * 5) = 2√5