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设a,b为正实数,,(a-b)2=4(ab)3,则logab=A.1B.-1C.±1D.
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设a,b为正实数,
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)
,(a-b)
2=4(ab)
3,则log
ab=( )
A.1
B.-1
C.±1
D.
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设a,b为正实数,
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设a,b,c均为不等于1的正实数,则下列等式中恒成立的是( )
A.logab•logcb=logca
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已知复数z=2+i的实数部为a,虚部为b,则a-b=( )
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设a>1,定义
,如果对任意的n∈N*且n≥2,不等式12f(n)+7logab>7loga+1b+7(a>0且a≠1)恒成立,则实数b的取值范围是( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADEAAAAjCAYAAAA9guKMAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAepJREFU
WEftmNuNAyEMRUnLtEMn1EEVNMFiHgMG84gggpF2pP1INoCPfa9N8jH2YW9/AOLtD3s7gFPSMQgl
QMb+j0uj80C0NDz+jwmjBkGegYAgRQxNGQEBo9fcyEClJa8hC6gjEFoplHkUKFQIVcZDPoxEVY5A
VHFA4CHKOvPaSM4Mj6W5FUKJLNPBDynzb4BA/vBpdtV4jO3Nf7GcIMv97nOtsaOslUhdiOyilbTo
XouNnRns1/MDMowkYs8uX4OMSkNT4Amiam0WozeQFijByKXmWRxqz6BrVckbPQf2ELCQmprNgbRA
sGUpzI4E6SBQiwuHdAfSlkAWN8mkbyGAanw/cdLq9bnFmL5e7mTn42YuuFJKxI5Utb4+eOuC5A02
04edZzZWoTY1ZfT6PZyDNMknINoDKQazNcHTm2UQIzn1BtINECCQYGy6Jw8HEpjKDqQzT2pIzRbb
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)
B.(0,1)
C.(0,4)
D.(1,+∞)
-
设a>1,定义
,如果对任意的n∈N*且n≥2,不等式12f(n)+7logab>7loga+1b+7(a>0且a≠1)恒成立,则实数b的取值范围是( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADEAAAAjCAYAAAA9guKMAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAepJREFU
WEftmNuNAyEMRUnLtEMn1EEVNMFiHgMG84gggpF2pP1INoCPfa9N8jH2YW9/AOLtD3s7gFPSMQgl
QMb+j0uj80C0NDz+jwmjBkGegYAgRQxNGQEBo9fcyEClJa8hC6gjEFoplHkUKFQIVcZDPoxEVY5A
VHFA4CHKOvPaSM4Mj6W5FUKJLNPBDynzb4BA/vBpdtV4jO3Nf7GcIMv97nOtsaOslUhdiOyilbTo
XouNnRns1/MDMowkYs8uX4OMSkNT4Amiam0WozeQFijByKXmWRxqz6BrVckbPQf2ELCQmprNgbRA
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04edZzZWoTY1ZfT6PZyDNMknINoDKQazNcHTm2UQIzn1BtINECCQYGy6Jw8HEpjKDqQzT2pIzRbb
HUgh6mUA12HqBFJnV5bELTYMu5k2uzPlz22ggLBgEn0fBe2XoPi9/rVjZ9DkXnjy+tuDrr9voxHQ
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/VRZ/5oxK6WzEOP+O/2Jw3KajrP7wX+IPXlc3+UPtD+eJvnHvMoAAAAASUVORK5CYII=
)
B.(0,1)
C.(0,4)
D.(1,+∞)
-
若
,则下列结论中不正确的是( )
A.logab>logba
B.|logab+logba|>2
C.(logba)2<1
D.|logab|+|logba|>|logab+logba|
-
若
,则下列结论中不正确的是( )
A.logab>logba
B.|logab+logba|>2
C.(logba)2<1
D.|logab|+|logba|>|logab+logba|
-
若
,则下列结论中不正确的是( )
A.logab>logba
B.|logab+logba|>2
C.(logba)2<1
D.|logab|+|logba|>|logab+logba|
-
若
,则下列结论中不正确的是( )
A.logab>logba
B.|logab+logba|>2
C.(logba)2<1
D.|logab|+|logba|>|logab+logba|
-
若
,则下列结论中不正确的是( )
A.logab>logba
B.|logab+logba|>2
C.(logba)2<1
D.|logab|+|logba|>|logab+logba|