已知集合A={X|Kπ+π/3≤Kπ+π/2,K∈Z.}B={X|x2-4≥0},则A ∩B=?
问题描述:
已知集合A={X|Kπ+π/3≤Kπ+π/2,K∈Z.}B={X|x2-4≥0},则A ∩B=?
答
A ∩B={X|Kπ+π/3≤Kπ+π/2,K∈Z,且k0}U[-2π /3,-2]
已知集合A={X|Kπ+π/3≤Kπ+π/2,K∈Z.}B={X|x2-4≥0},则A ∩B=?
A ∩B={X|Kπ+π/3≤Kπ+π/2,K∈Z,且k0}U[-2π /3,-2]