Question

repede,am nevoie urgent,va rog frumos!​

Answer 1

Explicație pas cu pas:

1.a) A; b) A; c) F ; d) F; e) F; f) A

2.

a) x ∈ N => x ∈ {0, 1, 3, 9, 15}

b) x ∈ Z => x ∈ {-8, -5, -2, 0, 1, 3, 9, 15}

c) x ∈ Z+ => x ∈ {0, 1, 3, 9, 15}

d) x ∈ Z\N => x ∈ {-8, -5, -2}

3.

a) |x| = 6 => x = -6; x = 6

x ∈ {-6; 6}

b) |x| = -3 < 0

x ∈ {Ø}

c) |3x| = 9

3x = -9 => x = -3

3x = 9 => x = 3

x ∈ {-3; 3}

d) |x - 3| = 0

x - 3 = 0 => x = 3

x ∈ {3}

e) |4x - 16| = 0

4x - 16 = 0

4x = 16 => x = 4

x ∈ {4}

f) |5 + 3x| = 0

5 + 3x = 0

3x = -5

x = -5/3 ∉ Z