原题：设集合A={a|a=3n+2,n属于z｝,集合B=｛b|b=3k} 求证：A=BB = {b | b = 3k - 1,k ∈ Z} = {b | b = 3（k - 1）+ 2,k - 1 ∈Z}因为A = {a |a = 3n + 2 ,n ∈ Z}而n和k - 1都可以取遍所有整数,所以A = B...