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若数列{an}的前n项和公式为Sn=log3(n+1),则a5等于A.log56B.C.l...
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若数列{a
n}的前n项和公式为S
n=log
3(n+1),则a
5等于( )
A.log
56
B.
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACYAAAAjCAYAAAD48HgdAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAGoSURBVFhH7ZXrkcMgDISpjJ5oh2YohVIIQmD0
wHdHzgF+ZGecSZzEfFqtwKRD9QWb1Rlg0SdrTDLGJh/x1naw6C0DatoLFlyGcinUj1QbwWLy1iTn
AA7amN8Twn1g1S0XkEa2dBtYAbE++9YUkiOuHQSGrbXVsu2t7LGqmeOO4U0ZwM+qrtkWBFDiIHEM
fjge3c8Jc4VTydfuYLD7rrPrV11gEMYWvBNEMqaPhSsH1e4heAlx/w1eo2fNCcGgjWx0s+rB2rur
4dU5V/7zTE4RDKpm+UKnZOSCk6DCxQkw7XK/yvfwwhfMEqOLggmijmkweM5TOc1gsCCvcjQIeqfO
qu1ulT4FBTKtjdG77oZorcrSpVyU7PdDMriorhba0pzQbUW1//7oFp3aQRH0GTc7/5xknsYFUkdx
l+ds+d5N0e+BFRcG0ycikGJki46GbGBi0b8cu1rQrrtVsoqj7Hu6eesi3wb7uwjADTgWyYdrAVhV
3VruhkQ6ug4sS7eTig/CUjA1HEx8T1wIBlkbbdKo4BZmjG2e8uQQx5k0cm0rJ/QFm9WhYCm9AMaN
SoERTQmdAAAAAElFTkSuQmCC
)
C.log
36
D.log
35
相关试题
-
若数列{an}的前n项和公式为Sn=log3(n+1),则a5等于( )
A.log56
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACYAAAAjCAYAAAD48HgdAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAHOSURBVFhH7ZddssMgCIVdmXtyO24mS3EpVEQi
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IVh7CFBYbqHH1PCszM2e6/2mXNSV022SHlhYyjnAP9icXgAfxo1KgbMGLdsAAAAASUVORK5CYII=
)
C.log36
D.log35
-
若数列{an}的前n项和公式为Sn=log3(n+1),则a5等于( )
A.log56
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACYAAAAjCAYAAAD48HgdAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAGoSURBVFhH7ZXrkcMgDISpjJ5oh2YohVIIQmD0
wHdHzgF+ZGecSZzEfFqtwKRD9QWb1Rlg0SdrTDLGJh/x1naw6C0DatoLFlyGcinUj1QbwWLy1iTn
AA7amN8Twn1g1S0XkEa2dBtYAbE++9YUkiOuHQSGrbXVsu2t7LGqmeOO4U0ZwM+qrtkWBFDiIHEM
fjge3c8Jc4VTydfuYLD7rrPrV11gEMYWvBNEMqaPhSsH1e4heAlx/w1eo2fNCcGgjWx0s+rB2rur
4dU5V/7zTE4RDKpm+UKnZOSCk6DCxQkw7XK/yvfwwhfMEqOLggmijmkweM5TOc1gsCCvcjQIeqfO
qu1ulT4FBTKtjdG77oZorcrSpVyU7PdDMriorhba0pzQbUW1//7oFp3aQRH0GTc7/5xknsYFUkdx
l+ds+d5N0e+BFRcG0ycikGJki46GbGBi0b8cu1rQrrtVsoqj7Hu6eesi3wb7uwjADTgWyYdrAVhV
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SoERTQmdAAAAAElFTkSuQmCC
)
C.log36
D.log35
-
已知等比数列{an}中,a1=
,公比q=
.
(I)Sn为{an}的前n项和,证明:Sn=![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAqCAYAAADS4VmSAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAFOSURBVFhH7ZcBDsMgCEU9mXfyOl7Go3gUBlhX
aecmWmuW9Ccu25KWB3xpNbBYD8AOED1YY8HH7fdNSgDBgTEG1yoAVgD3vwB07VbBQK10+E+bxgGE
dyJ4iyCuNfwPgOAoq8riIClgGY+usYosxipA5hXZEpDuHkMAlG0ZP3oLxnrEaNdlABwcW6MpPykB
sJH2/oqqftN7fqTA2TOdHlijiQDUUqwIe6L8LjUPIEaI2CLrA+4MHEzc5vOAmtoCngkYnC1x2rJJ
k1tg0dCp6MctmzUPoMy4Un7SNACRcd6u97agTQ/AeoA8y1csBuDPhXoA+gCK9wDtG9BRegAaq/uI
S4/ZT0O+UWqAGILIuOc9sNS4ByqP2VYNA9Qes60aAxB+6NMAAB1C2s+ANXUDBKc8RVXUBUDOF5VH
I/Z2Qg2QDx9y9bdizIQX6AFYDADwApKVtu0GtczeAAAAAElFTkSuQmCC
)
(II)设bn=log3a1+log3a2+…+log3an,求数列{bn}的通项公式.
-
已知等比数列{an}中,a1=
,公比q=
.
(I)Sn为{an}的前n项和,证明:Sn=![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAqCAYAAADS4VmSAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAFxSURBVFhH7ZeBCcQgDEWdzJ1cx2UcxVFyibZ3
sVZIrNYetFA4jkpefn6iGlj8mMXx4UEA0YM1Fny8V5OsQHBgjMF3FUCmAPe/AAS/KRiolA7TkT3M
hJ0KFN6J4C2COGl44F1QAwRHWTXeFCQH5PFojVU4+ZoCZN4iWwLSGfkSAGXL40dvwViPusifYQAp
OJZLIz9hZoBkpF+txR76zo8cePeMBuJBo1heNuGX22xInuC/y+XzFIgRIpbI+oCdgYMplbkeUPMA
0haD3sDgaSxULZuVmAiQB5sLuSmPLbsXYh4Az7gh/1QFioz3dj3p73kKCHvlBVivQHO/b50DBv4/
tQuEHpw5iGQI6z0g4zx8xc4B2hPQMZ5eARqr34m2bbPiE0ydrhoghlCc+XrOgRxDDVDl0NhmpaW9
DNDaZu8BKPwgDTnsSEaXEPkdsIXXXYLgdDegoQDk/KLz0Ii9nahW4PzC2l8KNUCf1dqrXoDlCnwA
kpW27e9aaMsAAAAASUVORK5CYII=
)
(II)设bn=log3a1+log3a2+…+log3an,求数列{bn}的通项公式.
-
已知等比数列{an}中,a1=
,公比q=
.
(I)Sn为{an}的前n项和,证明:Sn=![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAqCAYAAADS4VmSAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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=
)
(II)设bn=log3a1+log3a2+…+log3an,求数列{bn}的通项公式.
-
已知等比数列{an}中,a1=
,公比q=
.
(I)Sn为{an}的前n项和,证明:Sn=![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAqCAYAAADS4VmSAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAFxSURBVFhH7ZeBCcQgDEWdzJ1cx2UcxVFyibZ3
sVZIrNYetFA4jkpefn6iGlj8mMXx4UEA0YM1Fny8V5OsQHBgjMF3FUCmAPe/AAS/KRiolA7TkT3M
hJ0KFN6J4C2COGl44F1QAwRHWTXeFCQH5PFojVU4+ZoCZN4iWwLSGfkSAGXL40dvwViPusifYQAp
OJZLIz9hZoBkpF+txR76zo8cePeMBuJBo1heNuGX22xInuC/y+XzFIgRIpbI+oCdgYMplbkeUPMA
0haD3sDgaSxULZuVmAiQB5sLuSmPLbsXYh4Az7gh/1QFioz3dj3p73kKCHvlBVivQHO/b50DBv4/
tQuEHpw5iGQI6z0g4zx8xc4B2hPQMZ5eARqr34m2bbPiE0ydrhoghlCc+XrOgRxDDVDl0NhmpaW9
DNDaZu8BKPwgDTnsSEaXEPkdsIXXXYLgdDegoQDk/KLz0Ii9nahW4PzC2l8KNUCf1dqrXoDlCnwA
kpW27e9aaMsAAAAASUVORK5CYII=
)
(II)设bn=log3a1+log3a2+…+log3an,求数列{bn}的通项公式.
-
已知等比数列{an}中,a1=
,公比q=
.
(I)Sn为{an}的前n项和,证明:Sn=![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAqCAYAAADS4VmSAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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=
)
(II)设bn=log3a1+log3a2+…+log3an,求数列{bn}的通项公式.
-
已知等比数列{an}中,a1=
,公比q=
.
(I)Sn为{an}的前n项和,证明:Sn=![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAqCAYAAADS4VmSAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAFxSURBVFhH7ZeBCcQgDEWdzJ1cx2UcxVFyibZ3
sVZIrNYetFA4jkpefn6iGlj8mMXx4UEA0YM1Fny8V5OsQHBgjMF3FUCmAPe/AAS/KRiolA7TkT3M
hJ0KFN6J4C2COGl44F1QAwRHWTXeFCQH5PFojVU4+ZoCZN4iWwLSGfkSAGXL40dvwViPusifYQAp
OJZLIz9hZoBkpF+txR76zo8cePeMBuJBo1heNuGX22xInuC/y+XzFIgRIpbI+oCdgYMplbkeUPMA
0haD3sDgaSxULZuVmAiQB5sLuSmPLbsXYh4Az7gh/1QFioz3dj3p73kKCHvlBVivQHO/b50DBv4/
tQuEHpw5iGQI6z0g4zx8xc4B2hPQMZ5eARqr34m2bbPiE0ydrhoghlCc+XrOgRxDDVDl0NhmpaW9
DNDaZu8BKPwgDTnsSEaXEPkdsIXXXYLgdDegoQDk/KLz0Ii9nahW4PzC2l8KNUCf1dqrXoDlCnwA
kpW27e9aaMsAAAAASUVORK5CYII=
)
(II)设bn=log3a1+log3a2+…+log3an,求数列{bn}的通项公式.
-
已知等比数列{an}中,a1=
,公比q=
.
(I)Sn为{an}的前n项和,证明:Sn=![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAqCAYAAADS4VmSAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAFOSURBVFhH7ZcBDsMgCEU9mXfyOl7Go3gUBlhX
aecmWmuW9Ccu25KWB3xpNbBYD8AOED1YY8HH7fdNSgDBgTEG1yoAVgD3vwB07VbBQK10+E+bxgGE
dyJ4iyCuNfwPgOAoq8riIClgGY+usYosxipA5hXZEpDuHkMAlG0ZP3oLxnrEaNdlABwcW6MpPykB
sJH2/oqqftN7fqTA2TOdHlijiQDUUqwIe6L8LjUPIEaI2CLrA+4MHEzc5vOAmtoCngkYnC1x2rJJ
k1tg0dCp6MctmzUPoMy4Un7SNACRcd6u97agTQ/AeoA8y1csBuDPhXoA+gCK9wDtG9BRegAaq/uI
S4/ZT0O+UWqAGILIuOc9sNS4ByqP2VYNA9Qes60aAxB+6NMAAB1C2s+ANXUDBKc8RVXUBUDOF5VH
I/Z2Qg2QDx9y9bdizIQX6AFYDADwApKVtu0GtczeAAAAAElFTkSuQmCC
)
(II)设bn=log3a1+log3a2+…+log3an,求数列{bn}的通项公式.
-
(1)已知数列{an}为等比数列,公比为q,Sn为前n项和,试推导公式Sn=
;
(2)已知数列{an}的前n项和Sn.满足:Sn=n2-n(n∈N*),又数列{bn}满足:an+log3n=log3bn,求数列{bn}的前n项和Tn.