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已知函数f(x)=lg,若f(a)=b,则f(-a)等于A.bB.-bC.D.-
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已知函数f(x)=lg
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABoAAAAjCAYAAACKPxqrAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADwSURBVEhL7VXBDcMgDPRk7MQ6LMMojOLaoRCU
YkqpQyIUJB6JgLPvbB/gpAWTcPACoODQgEEXzskxZuQtAgDts4EiGtrbAiUmjMPIOAdLzOTvXYai
GD4z8pbpFLb171cCOsOU831LUPXVBOoti+AMBSSD8DsqQMgVW6GrDFQFyFNG31rjbyCmjeViPTfZ
qECyfEVKEWhr1l302sGjXqlQTOrwVIHC5QtGUG+JDZ5bMCOx86WJMPD/0LCD5HdeW1CjnPltHFYY
LZ0S/TC9LwWa4rDZ6LQdtkGdrsO2NFJ12AaQrsMKQI/D9jb48Ln1pvcL/535lVgcSIEAAAAASUVO
RK5CYII=
)
,若f(a)=b,则f(-a)等于( )
A.b
B.-b
C.
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aC0ujkYAAAAASUVORK5CYII=
)
D.-
相关试题
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已知函数f(x)=lg
,若f(a)=b,则f(-a)等于( )
A.b
B.-b
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAjCAYAAACgj+sEAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADDSURBVDhP7ZTrDcMgDIQ9mXfyOl6GURjF5Xi0
0JgGpIhfRUJRJDs+f+eYbPPQZrw9kBDVmNg0+rXHCkGMiNJdTcgfDSb/hBGvY9wOpWwafChXwtW8
B0bjZhoPVGgNrjyh9oCkBiVI5e/B78gNkqKya1ZPukuIpizp9/l9PgkYixs5A6UiB4NXe2E1bw/U
CpCDwCapvM+Hz5EDatOEKx1U8FdNkuTQwX6aACD7lpOX2RxvbvrtMgjtOL2yyQ9O64ocxLwAFKEC
aC0ujkYAAAAASUVORK5CYII=
)
D.-
-
已知函数f(x)=lg
,若f(a)=b,则f(-a)等于( )
A.b
B.-b
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAjCAYAAACgj+sEAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAACySURBVDhP7ZTREcMgCECZjJ1Yh2UcxVEooEm1
YqrtR/PRd2fuzOUFBBKQTX4hZBYEFM51/0IvJBIA0LUqOEnoL/R8KXjTrA9lUar3G4II19xROA64
slzw6wafC4lq6Kj4DV2EzBg2q6URsjCSDsY1T8HG4t3rlVMo6djg1bMga8yRKlg69uCRUtnPhy9I
x6o2FcbqWIT4m1AhqI79nyYFgCEd/5nNy+spnV3e7fQKtxNEHhShAmgieFvHAAAAAElFTkSuQmCC
)
D.-
-
已知函数f(x)=lg
,若f(a)=b,则f(-a)等于( )
A.b
B.-b
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAjCAYAAACgj+sEAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADDSURBVDhP7ZTrDcMgDIQ9mXfyOl6GURjF5Xi0
0JgGpIhfRUJRJDs+f+eYbPPQZrw9kBDVmNg0+rXHCkGMiNJdTcgfDSb/hBGvY9wOpWwafChXwtW8
B0bjZhoPVGgNrjyh9oCkBiVI5e/B78gNkqKya1ZPukuIpizp9/l9PgkYixs5A6UiB4NXe2E1bw/U
CpCDwCapvM+Hz5EDatOEKx1U8FdNkuTQwX6aACD7lpOX2RxvbvrtMgjtOL2yyQ9O64ocxLwAFKEC
aC0ujkYAAAAASUVORK5CYII=
)
D.-
-
已知函数f(x)=lg
,若f(a)=b,则f(-a)等于( )
A.b
B.-b
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAjCAYAAACgj+sEAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADDSURBVDhP7ZTrDcMgDIQ9mXfyOl6GURjF5Xi0
0JgGpIhfRUJRJDs+f+eYbPPQZrw9kBDVmNg0+rXHCkGMiNJdTcgfDSb/hBGvY9wOpWwafChXwtW8
B0bjZhoPVGgNrjyh9oCkBiVI5e/B78gNkqKya1ZPukuIpizp9/l9PgkYixs5A6UiB4NXe2E1bw/U
CpCDwCapvM+Hz5EDatOEKx1U8FdNkuTQwX6aACD7lpOX2RxvbvrtMgjtOL2yyQ9O64ocxLwAFKEC
aC0ujkYAAAAASUVORK5CYII=
)
D.-
-
已知函数f(x)=lg
,若f(a)=b,则f(-a)等于( )
A.b
B.-b
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAjCAYAAACgj+sEAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADDSURBVDhP7ZTrDcMgDIQ9mXfyOl6GURjF5Xi0
0JgGpIhfRUJRJDs+f+eYbPPQZrw9kBDVmNg0+rXHCkGMiNJdTcgfDSb/hBGvY9wOpWwafChXwtW8
B0bjZhoPVGgNrjyh9oCkBiVI5e/B78gNkqKya1ZPukuIpizp9/l9PgkYixs5A6UiB4NXe2E1bw/U
CpCDwCapvM+Hz5EDatOEKx1U8FdNkuTQwX6aACD7lpOX2RxvbvrtMgjtOL2yyQ9O64ocxLwAFKEC
aC0ujkYAAAAASUVORK5CYII=
)
D.-
-
已知函数f(x)=lg
,若f(a)=b,则f(-a)等于( )
A.b
B.-b
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAjCAYAAACgj+sEAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADDSURBVDhP7ZTrDcMgDIQ9mXfyOl6GURjF5Xi0
0JgGpIhfRUJRJDs+f+eYbPPQZrw9kBDVmNg0+rXHCkGMiNJdTcgfDSb/hBGvY9wOpWwafChXwtW8
B0bjZhoPVGgNrjyh9oCkBiVI5e/B78gNkqKya1ZPukuIpizp9/l9PgkYixs5A6UiB4NXe2E1bw/U
CpCDwCapvM+Hz5EDatOEKx1U8FdNkuTQwX6aACD7lpOX2RxvbvrtMgjtOL2yyQ9O64ocxLwAFKEC
aC0ujkYAAAAASUVORK5CYII=
)
D.-
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已知全集U=R,设函数y=lg(2x-1)的定义域为集合M,集合N={x|x≥2},则M∩(CUN)等于( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAjCAYAAADizJiTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAFRSURBVFhH7ZbhDYQgDIWZjJ1Yh2UYhVG4guKJ
Ao+a5tQLJMYflvLxaJ+o8JKhXsIZ/gTU26CVDtbfr3tbUWeCUoqep4MmEV0wE5RXTqCZpqI8OSl6
KsqWDEwgRX2wOtrQ8ujCNO+pUW/1xqO0JcJ09AtoCUhfktl/N2CcsEabT9MaK8xxhQQMQYW5inRR
hG3n8dQItqLE7aDeuXSceeyB9hu6HfR0WLEMnqjoEdQZFWo9ABXNDlB7i5duUa9ldgjKhckb4s5b
HMfQ1ac+HgPqTP8KKQ4a9YiqckaEKOqSGupYp2OgA4acwbiQsXnO9X8uAQw6aMhXlOSq3v0zjRoy
Z9ErsVVF65eSNX3DkK8sPjKncSnBU1uGjGfKReBW7RiyHAbOBED7hozTy0V0QZEhy2HgTE3QEUPG
6eUiqqCjhiyHgTPhZsI5fhIxQaVlfo2iH3QFq7/+OanNAAAAAElFTkSuQmCC
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAjCAYAAADizJiTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAF0SURBVFhH7ZbRrcMgDEWZjJ1Yh2UYhVF4dmhD
/DCxLajSVEGK8lEHH67tS125yXI34Sw/Appj8c6XmK/XfaxoCsU5B8+3g24iphIeUFs7CcP0KGqT
E6IfRc2SCR+AorlEjzZUH09M85oeTaG3xB2UAsLxNrNvBwhpsUa7T0MOH0Gu46riHXOOQRdzUQ4Q
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sqBvB+Dey/lxaIeT2kRcouj7QPZDIEgtLb++BJTzSwoslN6uDDQ7WIxl4aSTisNA9R2AFiUN06kh
UyQrJA5P3/9MC4j2RBp8ZMgV1gqpVx3L3q5SdpjUhqzPaow8uUL5PyWv/UeGbEyvDed8VTUBY0PW
pp6Pk0FPDXkeQLuDACoZsjbNfNwpqGzI8wDaHYagOkPWppmPY0HVhjyfX72DPEzqrT4b+ICu1vc2
iv4BsOfAueBf27kAAAAASUVORK5CYII=
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAjCAYAAADizJiTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAFsSURBVFhH7ZYBDoMgDEU5GXfiOlyGo3AURlEm
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jt7CAAAAAElFTkSuQmCC
)
D.
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已知函数f(x)=lg(x+3)的定义域为M,g(x)=
的定义域为N,则M∩N等于( )
A.{x|x>-3}
B.{x|-3<x<2}
C.{x|x<2}
D.{x|-3<x≤2}
-
已知下列四个式子
①sin21+cos21
②(lg2)2+lg2•lg5+lg5
③tan15°+tan30°+tan15°tan30°
④sin40°(
-tan10°)
化简结果等于1的式子的代号分别是________.
-
已知lg2=a,lg3=b,则lg12=( )
A.2a+b
B.a+b
C.2ab
D.2a-b