Răspuns:
Explicație pas cu pas:
(*^-^*)Salutare!
A = {x ∈ NI | x ∈ M₅, x < 32}
B = {x ∈ NI | x ∈ M₇, 3 < x + 2 < 54}
x < 32
dar x ∈ M₅ ⇒ x ∈ {0, 5, 10, 15, 20, 25, 30}
A = {0, 5, 10, 15, 20, 25, 30}
3 < x + 2 < 54 |-2
3 -2 < x + 2 - 2 < 54 - 2
1 < x < 52 ⇒ x ∈ {1, 2, 3, ......50, 51}
dar x ∈ M₇ ⇒ x ∈ {7, 14, 21, 28, 35, 42, 49}
B = {7, 14, 21, 28, 35, 42, 49}
#copaceibrainly