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已知函数f(x)=log2,若f(a)=,则f(-a)=A.2B.-2C.D.-
试题详情
已知函数f(x)=log
2![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABoAAAAjCAYAAACKPxqrAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAPdJREFU
SEvtVsENwyAMpCt7HTZhDqZgCdeGQmiKCSKERKiWeCSCHL6zfXkhhZoRDDQj1AwQz1oCcgZBARp3
DXQAspp1onU1UEBD/VigyAQYDIzzZYmZ9LzJkBXDb0ZWM53C0vbzFYcGmHI+rwmqHFWg1rJwBuhC
Msh31Z3RiCu2QFd+0SEZWcroqDVOAzFtLBfr6WWjAknyZSkFIN+sm+iljXu9YqFA7PBYgcLhG0ZQ
a4l17lswI7HzpYnQ8X7XsJ3kNx5bUKPnOawwWholyv4Zjqb3rUBTHDYZ3WiHrVA31mFrGg112ArQ
WIcVgP4O29rg3fvWm95vm4e2DKdlifoAAAAASUVORK5CYII=
)
,若f(a)=
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAjCAYAAACpZEt+AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAKVJREFU
OE/dU9ENhTAIxJVZh02YgylYAqGNlVptNO/FD0mapskB1+NYzANmEYBZwH2AsiGgsfYptYJQ8PBz
Bagoo48DikihQz0ku1gPpL4Yyh8qbMTO7mKm+374jWQzjAuFbNlUYKFiky5M46AkJahIl6GMXZXx
F9EuVziSF5oNq+NTU1MLNUZyb5/tRVmNcSdahWCeTRKLtL0hSI2D2lu9NqyJKVYckNqVrS3EAwAA
AABJRU5ErkJggg==
)
,则f(-a)=( )
A.2
B.-2
C.
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAjCAYAAACpZEt+AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAKVJREFU
OE/dU9ENhTAIxJVZh02YgylYAqGNlVptNO/FD0mapskB1+NYzANmEYBZwH2AsiGgsfYptYJQ8PBz
Bagoo48DikihQz0ku1gPpL4Yyh8qbMTO7mKm+374jWQzjAuFbNlUYKFiky5M46AkJahIl6GMXZXx
F9EuVziSF5oNq+NTU1MLNUZyb5/tRVmNcSdahWCeTRKLtL0hSI2D2lu9NqyJKVYckNqVrS3EAwAA
AABJRU5ErkJggg==
)
D.-
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