设A={x|x是小于9的正整数},B={1,2,3},C={3,4,5,6},求A∩B,A∩C,A∩(B∪C),A∪(B∩C).
题型:解答题难度:一般来源:甘肃省月考题
设A={x|x是小于9的正整数},B={1,2,3},C={3,4,5,6},求A∩B,A∩C,A∩(B∪C),A∪(B∩C). |
答案
解:A={x|x是小于9的正整数}={1,2,3,4,5,6,7,8}, 又B={1,2,3},C={3,4,5,6}, ∴A∩B={1,2,3}, A∩C={3,4,5,6}, B∪C={1,2,3,4,5,6}, A∩(B∪C)={1,2,3,4,5,6}, A∪(B∩C)={1,2,3,4,5,6,7,8}. |
举一反三
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