A={9,5,-4}; B={9,-2,-2};A∩B=?A={9,5,-4}; B={9,-2,-7};A∩B=?都是9?

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A={9,5,-4}; B={9,-2,-2};A∩B=?A={9,5,-4}; B={9,-2,-7};A∩B=?都是9?
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A={9,5,-4}; B={9,-2,-2};A∩B=?A={9,5,-4}; B={9,-2,-7};A∩B=?都是9?
A={9,5,-4};
B={9,-2,-2};
A∩B=?
A={9,5,-4};
B={9,-2,-7};
A∩B=?
都是9?

A={9,5,-4}; B={9,-2,-2};A∩B=?A={9,5,-4}; B={9,-2,-7};A∩B=?都是9?
都是A∩B={9}
第一个B中不可能有两个相同元素