集合A={x||x-1|≤2x∈Z} B={x| 5 x+1 ≥1 x∈N} ,满足(A∩B)∪C
1个回答

∵|x-1|≤2,∴-2≤x-1≤2,即-1≤x≤3,又x∈Z,∴x=-1,0,1,2,3.因此A={-1,0,1,2,3}.

5

x+1 ≥1 ,x∈N,∴x≤4,且x∈N,∴x=0,1,2,3,4.即B={0,1,2,3,4}.

A∩B={0,1,2,3},A∪B={-1,0,1,2,3,4}.

满足(A∩B)∪C=A∪B的集合C必须含有元素-1,4.而其它的元素可以是集合{0,1,2,3}的任意子集的所有元素,而集合{0,1,2,3}的子集共有16个,故正确答案为D.

故选D.