若函數(shù)的定義域?yàn)?img width=16 height=17 src="http://thumb.zyjl.cn/pic1/1899/sx/55/79655.gif">，則實(shí)數(shù)的取值范圍是             ．

已知函數(shù)的定義域是，則實(shí)數(shù)取值范圍是（　�。�

A．         B．         C．            D．

設(shè)函數(shù)的定義域?yàn)?img src="http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/2013051911331536267747/SYS201305191133561751575099_ST.files/image002.png">，則實(shí)數(shù)的取值范圍是       ．

已知函數(shù)的定義域是，則實(shí)數(shù)取值范圍是（　�。�

A．

B．

C．

D．

設(shè)函數(shù)的定義域?yàn)?img src="http://thumb.zyjl.cn/pic5/tikupic/8b/a/g31yc.png" style="vertical-align:middle;" />，則實(shí)數(shù)的取值范圍是       ．