Question

Даны множества A - {x ∈ R : -4 ≤ x < 3} и B - {x ∈ R : 2 ≤ x ≤5}. Множество В-А имеет вид 1) ∅ 2) {x ∈ R : 3 ≤ x ≤ 5} 3) {x ∈ R : 5 < x < +∞} 4) {x ∈ R : -∞ < x < 3}

Answer 1

Ответ:

2

Пошаговое объяснение:

вроде бы 2, но 3 не должна быть вклчена, если подразумивается выбрасывание элементов множества А из множества В

Answer 2

To find the set B - A, we need to remove all the elements that are common to both sets A and B from set B.

Given: A = {x ∈ R : -4 ≤ x < 3} B = {x ∈ R : 2 ≤ x ≤ 5}

First, let's list the elements of set A: A = {-4, -3, -2, -1, 0, 1, 2}

Now, let's list the elements of set B: B = {2, 3, 4, 5}

To find B - A, we remove the elements in A from set B:

B - A = {x ∈ R : (x is in B) AND (x is not in A)}

B - A = {x ∈ R : (x = 2 OR x = 3 OR x = 4 OR x = 5) AND (x is not in A)}

Removing the elements that are in A from B:

B - A = {x ∈ R : (x = 3 OR x = 4 OR x = 5)}

So, the set B - A is {x ∈ R : 3 ≤ x ≤ 5}.

The correct answer is option 2) {x ∈ R : 3 ≤ x ≤ 5}.