设A={1,3,5,7},B={2,3,4,9},则AnB=____,AUB____.谢

问题描述:

设A={1,3,5,7},B={2,3,4,9},则AnB=____,AUB____.谢
设A={1,3,5,7},B={2,3,4,9},则AnB=____,AUB____.

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