Réponse :
Bonsoir
a) 0,333 ∈ D
b) √36 - 3 = 6 - 3 = 3 ⇔ (√36 - 3) ∈ N
c) (2 - √7)(2 + √7) = 2² - (√7)² = 4 - 7 = -3 ⇔ ∈ Z
d) -10³ = -1000 ∈ Z
e) 10⁻³ = 0,001 ∈ D
f) (1 - 3/4)/(2/3 + 1/4) = (1/4)/(8/12 + 3/12) = (1/4)/(11/12) = (1/4)×(12/11) = 3/11 ∈ Q
