设A ={1,2,3,6,9,18},≤为整除关系。(1)画出< A,≤>的哈斯图;(2)求子集B ={3,6,9}的极大元、极小元、最大元、最小元。
(2)B ={3,6,9}的极大元:6、9。极小元:3。最大元:无。最小元:3。
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