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B = {x: x < 5 i x ∈ N} = {4, 3, 2, 1, 0}
3 ∈ B i 3 ∉ A => A nie zawiera B
A = {x: x = √(1 + 9/16)} = {x: x = √(25/16)} = {5/4}
B = {x: x ∈ N} = N = {0, 1, 2 , 3, 4, ...}
3 ∈ B i 3 ∉ A => A nie zawiera B
A = {x: x ∈ NW} = NW
B = {x: x = √13} = {√13}
√13 ∈ NW i √13 jedyny element B => B zawiera się w A
A = {x: x ∈ N} = N = {0, 1, 2 , 3, 4, ...}
B = {x: IxI = 6} = {- 6, 6}
- 6 ∈ B i - 6 ∉ A => A nie zawiera B
jak masz pytania to pisz na pw