A={x|x=(6a+1)/6,a∈Z},
B={x|x=(3b-2)/6,b∈Z},
C={x|x=(3c+2)/6,c∈Z},
A={...,-5/6,1/6,7/6,13/6,19/6,...}----分母为六,分子依次加6
B={...,-5/6,-2/6,1/6,4/6,7/6,10/6,13/6,16/6,19/6,...}----分母为六,分子依次加3
C={...,2/6,5/6,8/6,11/6,14/6,17/6,20/6,...}----分母为六,分子依次加3
因此,A包含于B,A交C等于空集,B交C等于空集