M=｛x|n=x/2,n∈Z}
=｛x| x=2n n∈Z}
= { 0,±2,±4,±6,.}
N={x|n=x/2 +1 ,n∈Z｝
={x| x= 2(n-1),n∈Z｝
={ 0,±2,±4,±6,.} =M
M∩N =M