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下列函數中,值域為的函數是                                              

A．               B．         C．        D．

A.

B.

C.

D.

A.y=                               B.y=3x+1(x＞0)

C.y=x²+x+2                                        D.y=

A.y=         B.y=()^1-x                 C.y=               D.y=

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