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问题详情:

(  )                                                   ...(  )                                                                                                 

A.(  )                                                   ... 第2张  B.-(  )                                                   ... 第3张  C.(  )                                                   ... 第4张  D.-(  )                                                   ... 第5张

【回答】

解答: (  )                                                   ... 第6张故*选A

知识点:数系的扩充与复数的引入

题型:选择题

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