设全集U={小于9的正整数},A={1,2,3},B={3,4,5,6}求A∪B,Cu(A∪B)要详细.

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设全集U={小于9的正整数},A={1,2,3},B={3,4,5,6}求A∪B,Cu(A∪B)要详细.
设全集U={小于9的正整数},A={1,2,3},B={3,4,5,6}求A∪B,Cu(A∪B)要详细.

设全集U={小于9的正整数},A={1,2,3},B={3,4,5,6}求A∪B,Cu(A∪B)要详细.