高一数学 已知全集y={1,2,3,4,5,6,7,8,9}a={1,2,6}b={2,6,7,8}则
3个回答
cua={3,4,5,7,8,9} cub={1,3,4,5,9}
交集={3,4,5,9}
并集={1,3,4,5,7,8,9}
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