定义A－B = {x| x
A，且x
B}，若A =" {2," 4, 6, 8, 10}，B =" {1," 4, 8}，则A－B等于
(2)
| A．{4, 8} | B．{1, 2, 6, 10} | C．{1} | D．{2, 6, 10} |
相关试题
，则（ ）
（a∈R）是纯虚数，则a的值为（ ）
=（ ）推荐套卷
定义A－B = {x| x A，且x B}，若A =" {2," 4, 6, 8, 10}，B =" {1," 4, 8}，则A－B等于
(2)
| A．{4, 8} | B．{1, 2, 6, 10} | C．{1} | D．{2, 6, 10} |
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