Question

Cho A= \(\left[3;10\right]\) ; B=\(\left(4;20\right)\) ; C=\(\left(5;+\infty\right)\)

Hãy xác định:

a) \(\left(A\cap B\right)\) \(\cap\) C

b) \(\left(A\cup B\right)\) \(\cup\) C

c) A\B, B\C, C\A

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

e) (B \(\cup\) C) \ A

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

Answer 1

a: \(\left(A\cap B\right)\cap C=(4;10]\cap\left(5;+\infty\right)=(5;10]\)

c: A\B=[3;4]

B\C=(4;5]

C\A=[3;5]

d: (A\B) giao C=[3;4] giao (5;+\(\infty\))=[4;5)