Question

值域为(0,+∞)的函数是

A.y=5                                                        B.y=()^1－x

C.y=                                                   D.y=

Answer 1

解析:y=5的值域为(0,1)∪(1,+∞),y=()^1－x=3^x－1的值域为(0,+∞),y=的值域为［0,1),y=的值域为［0,+∞).

答案:B