设全集U=R,A={x｜x≥6}⑴求A∩Φ,A∪Φ⑵求A∩R,A∪R⑶CuA

Question

设全集U=R,A={x｜x≥6}
⑴求A∩Φ,A∪Φ
⑵求A∩R,A∪R
⑶CuA

Answer 1

1)A∩Φ=Φ,A∪Φ=A={x｜x≥6}
2)A∩R=A={x｜x≥6},A∪R=R
3)CuA={x｜x＜6}