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已知函數(shù)，則（　�。�

A．函數(shù)的定義域?yàn)?img src="http://thumb.zyjl.cn//pic6/res/gzsx/web/STSource/2014030705315811523833/SYS201403070532086308225574_ST.files/image003.png">，值域?yàn)?img src="http://thumb.zyjl.cn//pic6/res/gzsx/web/STSource/2014030705315811523833/SYS201403070532086308225574_ST.files/image004.png">

B．函數(shù)的定義域?yàn)?img src="http://thumb.zyjl.cn//pic6/res/gzsx/web/STSource/2014030705315811523833/SYS201403070532086308225574_ST.files/image003.png">，值域?yàn)?img src="http://thumb.zyjl.cn//pic6/res/gzsx/web/STSource/2014030705315811523833/SYS201403070532086308225574_ST.files/image005.png">

C．函數(shù)的定義域?yàn)?img src="http://thumb.zyjl.cn//pic6/res/gzsx/web/STSource/2014030705315811523833/SYS201403070532086308225574_ST.files/image003.png">，值域?yàn)?img src="http://thumb.zyjl.cn//pic6/res/gzsx/web/STSource/2014030705315811523833/SYS201403070532086308225574_ST.files/image006.png">

D．函數(shù)的定義域?yàn)?img src="http://thumb.zyjl.cn//pic6/res/gzsx/web/STSource/2014030705315811523833/SYS201403070532086308225574_ST.files/image006.png">，值域?yàn)?img src="http://thumb.zyjl.cn//pic6/res/gzsx/web/STSource/2014030705315811523833/SYS201403070532086308225574_ST.files/image006.png">

已知集合，則=（　�。�

A．       B．          C．            D．

已知集合，則(     )

A.        　 B. 　　　C.  　    D.

若兩個(gè)等差數(shù)列和的前項(xiàng)和分別是和，已知＝，則＝(　　)

A．7               B.                  C.                 D.

已知為等比數(shù)列,,,則（　 ）

A．              B．               C．              D．