a) \(\left\{-2;-1;0;1;2;3;4;5\right\}\)

b) \(\varnothing\)

c) \(\left\{2\right\}\)

d) \(\left\{0;1;2;3;4;5\right\}\)

là sao

b) rỗng

c) rỗng

d) N

e) N

f) Z

(cái nào nhỏ hơn thì lấy thôi)

Chọn B

a)\(Q\cap I=\varnothing\)

b)\(R\cap I=I\)

A

a) Q \(\cap\) I = \(\varnothing\)

b) R \(\cap\) I = I

a) Q \(\cap\) I = ∅

b) R \(\cap\) I = I

a: A\(\cup\) B=(-∞;2]\(\cup\) [2;+∞)

=(-∞;+∞)

A\(\cap\) B=(-∞;2]\(\cap\) [2;+∞)

={2}

B\(\cap\) C=[2;+∞)\(\cap\) (-2;2]

={2}

A\(\cap\) B\(\cap\) C=(-∞;2]\(\cap\) [2;+∞)\(\cap\) (-2;2]

={2}

A\B=(-∞;2]\[2;+∞)

=(-∞;2)

(A\(\cap\) B)\C={2}\(-2;2]

=∅

\(C_{R}A\) =R\A=R\(-∞;2]

=(2;+∞)

\(C_{R}B\) =R\B=R\[2;+∞)

=(-∞;2)

\(C_{R}C\) =R\C

=R\(-2;2]

=(-∞;-2]\(\cup\) (2;+∞)

Bài 1:

a: A={1;2;3}; B={2;3;6;7}

A\(\cap\) B={1;2;3}\(\cap\) {2;3;6;7}

={2;3}

A\(\cup\) B={1;2;3}\(\cup\) {2;3;6;7}

={1;2;3;6;7}

A\B={1;2;3}\{2;3;6;7}

={1}

B\A={2;3;6;7}\{1;2;3}={6;7}

b: B={2;3;6;7}; C={3;4;5;8}

B\C={2;3;6;7}\{3;4;5;8}

={2;6;7}

A={1;2;3}; B\C={2;6;7}

A\(\cap\) (B\C)

={1;2;3}\(\cap\) {2;6;7}

={2}

A\(\cap\) B={2;3}; A\(\cap\) C={1;2;3}\(\cap\) {3;4;5;8}={3}

(A\(\cap\) B)\(A\(\cap\) C)

={2;3}\{3}

={2}

Do đó: A\(\cap\) (B\C)=(A\(\cap\) B)\(A\(\cap\) C)

Bài 2:

a: A\(\cap\)A=A

A\(\cup\)A=A

A\(\cap\) ∅=∅

A\(\cup\) ∅=A

b: A\A=∅

A\∅=A

∅\A=∅