有關C129的精選大全

記,則的值為  A.1                  B.2                  C.129...
問題詳情:記,則的值為  A.1                  B.2                  C.129                D.2188【回答】C【解析】【詳解】中,令,得.∵展開式中∴故選C.點睛:二...
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