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集合A={xx=2n+1,n∈N}={1,3,5,7,9 ……} 所以A∩B={1,3,5,7,9} 集合C={xx=3n,n∈N}= {0,3,6,9,12 ……} 故(A∩B)∩C={1,3,5,7,9}∩{0,3,6,9,12 ……}={3,9} 答案:(A∩B)∩C{3,9}
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