A.()<()<()                                          B.()<()<()

C.()<()<()                                          D.()<()<()

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

C.y=                                                   D.y=

A.a=1或a=2                                                   B.a=1

C.a=2                                                            D.a>0且a≠1

A.AB                                                           B.AB

C.AB                                                           D.A=B

(1)若a^－0.3<a^0.2，则a∈________；(2)若a^7.5<a^4.9，则a∈________；(3)若a<1，则 a∈________；(4)若a<a，则a∈________.

A.1<|a|<2                                                        B.|a|<1

C.|a|>1                                                            D.|a|>

A.f(xy)=f(x)f(y)                                                B.f(xy)=f(x)+f(y)

C.f(x+y)=f(x)f(y)                                              D.f(x+y)=f(x)+f(y)