A={x\x=kπ+(-1)的k次方.π/2}B={x\x=2kπ+π/2},则A.B的关系是?

问题描述:

A={x\x=kπ+(-1)的k次方.π/2}B={x\x=2kπ+π/2},则A.B的关系是?

B真包含于A