设*=A.R                                                ...

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问题详情:

设*设*=A.R                                                ...=

A.R                                                              B.设*=A.R                                                ... 第2张                      

C.{0}                                                           D.设*=A.R                                                ... 第3张

【回答】

B

知识点:*与函数的概念

题型:选择题

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