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设等比数列{an}中,前n项之和为Sn,已知S3=8,S6=7,则a7+a8+a9=A.B...
试题详情
设等比数列{a
n}中,前n项之和为S
n,已知S
3=8,S
6=7,则a
7+a
8+a
9=( )
A.
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAjCAYAAACdHYpiAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADHSURBVEhL7VXRDYUgDOxk3anrdBlGYZSTgj5E
86RC8qLJIyH406N3Xg/C5KLJevwQICqYGBrbnn0dBAERpT0KkC8NkD/AqzXIJjIflC2hmslnpIuB
eQBAkMpt4/g592S/0OhSOIHuxDTMLkAvcN4C0BipDRUHhQhlAq9ZFpVBrNiSzQFwSKIcb5LyqSwH
QAoz88p6q30PzEKhcRwkdwdIjFUEkkGGRKxFxfp3NDg9KK2oDhGtoP7GpOjNDkypOSNdj5ODwtMB
FkiEGO/8vSG+AAAAAElFTkSuQmCC
)
B.
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAjCAYAAACpZEt+AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAACgSURBVDhP3VPbDYAgDOxk3anrdBlHYZSzUBSL
KD/ED0kIpDn6uDsIk0ULAUnBxNAUc3qJTUBEtp8AjoL8HFBIyjz4lq2RtVKLB1nnJY7GRmdOOs+w
yFGBqGga6yFBmcDVa0kZxGpRXwbonFTsJxY9AdmSpkF9le8DLbxML9SFBwOIQApo2GQLlnKhh9uH
iU3XKdqY/om6KfBO1LsaH6i5A0Go0ozyYMc5AAAAAElFTkSuQmCC
)
C.
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAAjCAYAAABLuFAHAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAEUSURBVEhL1VSBDcQgCHQyd2IdlnEUR+FVRMHS
xqZNmm/yaV85uTuEQA+e8ABL74AzRgoh8C8i5U4pQV+TvfKGxJs9cyJQgCElI2EP5LVMGCNhP5nB
CcZpxoOcBwPGIkWVpIDraUINyCRa3KzSoqSdtDmK9U1aFmspK80zrBknjmj0QtkFl/yueSvlc/Ah
85GyC07gaHYoM7huOBfAyrUuy94713Mp6dbfDzOPTlKm7ayd1HlLbgv6ULNL0lycsy5zaXN/S9+2
LvOmjK+5dJXu6TJlQvCHhGtYGwo9W/322vvC7TmazoDXYChDsc2224ZNAM+1Xc2tTDrbYqCqrWNY
DZ6lqjN9P7MM99EotzT/b2NsMv8BjD9j+GKXsfMAAAAASUVORK5CYII=
)
D.
相关试题
-
设等比数列{an}中,前n项之和为Sn,已知S3=8,S6=7,则a7+a8+a9=( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAjCAYAAACdHYpiAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAANBJREFU
SEvtVcERhCAMjC2nnXSSOqiCJnIJ6CE6SoB7eDNmhtFPluy6WRfRgpkygJmCmeY0vRsgsiCgcKw7
fACBTCc9owDp0iD0Avy1BslE5oN8KBQz+Yx0Y9cHAAQq3DaO3+ee7AWNJoUT6E7MvnUenaCVF00K
vwGojFSHimOCKIwguGZZZBRAli3ZHACHJErxRppPuRwAGmbmlfVWex/YhUzjuEjuCUQZM5FQAhkS
sTRl6/docPqh1KI6RLSG8hlV0c4JTKk5I92b2UHh6QAfhQ7upWno+IsAAAAASUVORK5CYII=
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAjCAYAAACpZEt+AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAKdJREFU
OE/dU9sRxCAIJC3TDp1QR6qwCcLDi8EYJ7nL1zHj6DCrLsuyiAbMwgCzgPuAwoKAwiVfiRdWMh66
rgCBEvpzgItkOsSitYn1QOqLprzwwofYaHcz3ffDbySTUNk0yqEIIwhWrxVGAWTNRiigc5LbjzS7
A8yS2oN6y86DXsQ3faMOOiiASMhBQ5It6d8lDqeByaRrFa3MGKKuCpkL9dp0f9vNDRirx7OnsKp7
AAAAAElFTkSuQmCC
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAAjCAYAAABLuFAHAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAARtJREFU
SEvNVIsNxCAI7a3sOm7iHE7hEhyIPxAbay7pmTS9kz54PD4fwHOdHgKfnusUmBlXcAqO6PPjAqRi
iL7cVRu+fWRjAUfwA6CxSQFC+ZDvEgTnIBTPDI6+eRNppNQYMDaAG4IgmLxVah5EICUIpeZq2DFn
JkBOOi2JlZSFYEK4qsiIVpRNMMY3xdOU1+Ap8kzZBEdv5GxQZjAZjAaQ6UqVq+037alKuvX3xcht
kgbRdu4Wdd5KN3/0Ys4TSdE0qwljlKLNs11nNq8ma8OUiAqMEzXOM26Y61oviEmwvBBKNPptjfZN
b/e1dAdclArBHhdi3muPBesA3mm7OecyjdGUgKquhtq9VLTP9yOT5/Mm2R+KfxuMB8y//vlEqKMM
2HsAAAAASUVORK5CYII=
)
D.
-
设等比数列{an}中,前n项之和为Sn,已知S3=8,S6=7,则a7+a8+a9=( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAjCAYAAACdHYpiAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAC0SURBVEhL7ZXRDcMgDEQ9mXfyOl6GURjlAsYS
JUlbB36K1JMcJUR+weYghEXtBMgKJoZmf3bFAElARCVmAaYE+QO2BpiJqg9aSPLxogczuNcPAJL0
2i7xWuwbfZ3BLdjD3tt1QbsABiONbgwAMpQJ7FlZGcRaRpsCgNMesONNymhTqATzin+13k/shVZG
7cHZW3GACMQgU03sSc36T3pw+aGMTQ3MoCb0ZZxahUUjfdb2AOAASIQY7/4L7ugAAAAASUVORK5C
YII=
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAjCAYAAACpZEt+AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAACdSURBVDhP3ZPRDcMwCESZjJ1Yh2U8ike54jOV
45YmP2k/ehJRQl7MgWPBhe4EukNF4T2fUxNoBhGJ+ARQDfbnAIc05jDDGrPUYYVavwCexqogwOuJ
7gK2Qe3TDKDDVaCZ7a4Q9chOBfCyB/z9LLJTLNEsls6vxn2xF7PM8HB8ObQAMxih0uRKstzm4e3A
7Kazi9Vm2cXFoM71dQB4AEGo0oyaMf33AAAAAElFTkSuQmCC
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAAjCAYAAABLuFAHAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAD2SURBVEhL1ZThDcQgCIWdzJ1Yx2UcxVE4QK1Q
IWmvf9ov8XJpffCgSsIHvEDcSsaUUl+5YBvPK4xnakHt74a4IijBQStYxsZOw5IzlrGxiysc0Qyt
2YAULKskJOZo0xKQhxguLc+0hGlYr2/ZsljLjBEz0jivhpNlZhNHzTtbZnzxlnm3zGziCk7NjmUm
yQvnAGg8y4xj+zpfFc9G3V0ilt8/eZvYHJzolrnifr/niZJb5k0ZwhHTxdDZaMpEQ8K1LUNhZOP/
7ogigoat0RQJmVgMNBQlwO2GLUGfa1drls+ks50aqHAy8+b1qW53+8Ehuc4nxYg/jD9j+Hy7AM8A
AAAASUVORK5CYII=
)
D.
-
设等比数列{an}中,前n项之和为Sn,已知S3=8,S6=7,则a7+a8+a9=( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAjCAYAAACdHYpiAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAANBJREFU
SEvtVcERhCAMjC2nnXSSOqiCJnIJ6CE6SoB7eDNmhtFPluy6WRfRgpkygJmCmeY0vRsgsiCgcKw7
fACBTCc9owDp0iD0Avy1BslE5oN8KBQz+Yx0Y9cHAAQq3DaO3+ee7AWNJoUT6E7MvnUenaCVF00K
vwGojFSHimOCKIwguGZZZBRAli3ZHACHJErxRppPuRwAGmbmlfVWex/YhUzjuEjuCUQZM5FQAhkS
sTRl6/docPqh1KI6RLSG8hlV0c4JTKk5I92b2UHh6QAfhQ7upWno+IsAAAAASUVORK5CYII=
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAjCAYAAACpZEt+AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAKdJREFU
OE/dU9sRxCAIJC3TDp1QR6qwCcLDi8EYJ7nL1zHj6DCrLsuyiAbMwgCzgPuAwoKAwiVfiRdWMh66
rgCBEvpzgItkOsSitYn1QOqLprzwwofYaHcz3ffDbySTUNk0yqEIIwhWrxVGAWTNRiigc5LbjzS7
A8yS2oN6y86DXsQ3faMOOiiASMhBQ5It6d8lDqeByaRrFa3MGKKuCpkL9dp0f9vNDRirx7OnsKp7
AAAAAElFTkSuQmCC
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAAjCAYAAABLuFAHAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAARtJREFU
SEvNVIsNxCAI7a3sOm7iHE7hEhyIPxAbay7pmTS9kz54PD4fwHOdHgKfnusUmBlXcAqO6PPjAqRi
iL7cVRu+fWRjAUfwA6CxSQFC+ZDvEgTnIBTPDI6+eRNppNQYMDaAG4IgmLxVah5EICUIpeZq2DFn
JkBOOi2JlZSFYEK4qsiIVpRNMMY3xdOU1+Ap8kzZBEdv5GxQZjAZjAaQ6UqVq+037alKuvX3xcht
kgbRdu4Wdd5KN3/0Ys4TSdE0qwljlKLNs11nNq8ma8OUiAqMEzXOM26Y61oviEmwvBBKNPptjfZN
b/e1dAdclArBHhdi3muPBesA3mm7OecyjdGUgKquhtq9VLTP9yOT5/Mm2R+KfxuMB8y//vlEqKMM
2HsAAAAASUVORK5CYII=
)
D.
-
设等比数列{an}中,前n项之和为Sn,已知S3=8,S6=7,则a7+a8+a9=( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAjCAYAAACdHYpiAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAANBJREFU
SEvtVcERhCAMjC2nnXSSOqiCJnIJ6CE6SoB7eDNmhtFPluy6WRfRgpkygJmCmeY0vRsgsiCgcKw7
fACBTCc9owDp0iD0Avy1BslE5oN8KBQz+Yx0Y9cHAAQq3DaO3+ee7AWNJoUT6E7MvnUenaCVF00K
vwGojFSHimOCKIwguGZZZBRAli3ZHACHJErxRppPuRwAGmbmlfVWex/YhUzjuEjuCUQZM5FQAhkS
sTRl6/docPqh1KI6RLSG8hlV0c4JTKk5I92b2UHh6QAfhQ7upWno+IsAAAAASUVORK5CYII=
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAjCAYAAACpZEt+AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAKdJREFU
OE/dU9sRxCAIJC3TDp1QR6qwCcLDi8EYJ7nL1zHj6DCrLsuyiAbMwgCzgPuAwoKAwiVfiRdWMh66
rgCBEvpzgItkOsSitYn1QOqLprzwwofYaHcz3ffDbySTUNk0yqEIIwhWrxVGAWTNRiigc5LbjzS7
A8yS2oN6y86DXsQ3faMOOiiASMhBQ5It6d8lDqeByaRrFa3MGKKuCpkL9dp0f9vNDRirx7OnsKp7
AAAAAElFTkSuQmCC
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAAjCAYAAABLuFAHAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAARtJREFU
SEvNVIsNxCAI7a3sOm7iHE7hEhyIPxAbay7pmTS9kz54PD4fwHOdHgKfnusUmBlXcAqO6PPjAqRi
iL7cVRu+fWRjAUfwA6CxSQFC+ZDvEgTnIBTPDI6+eRNppNQYMDaAG4IgmLxVah5EICUIpeZq2DFn
JkBOOi2JlZSFYEK4qsiIVpRNMMY3xdOU1+Ap8kzZBEdv5GxQZjAZjAaQ6UqVq+037alKuvX3xcht
kgbRdu4Wdd5KN3/0Ys4TSdE0qwljlKLNs11nNq8ma8OUiAqMEzXOM26Y61oviEmwvBBKNPptjfZN
b/e1dAdclArBHhdi3muPBesA3mm7OecyjdGUgKquhtq9VLTP9yOT5/Mm2R+KfxuMB8y//vlEqKMM
2HsAAAAASUVORK5CYII=
)
D.
-
设等比数列{an}中,前n项之和为Sn,已知S3=8,S6=7,则a7+a8+a9=( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAjCAYAAACdHYpiAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADHSURBVEhL7VXRDYUgDOxk3anrdBlGYZSTgj5E
86RC8qLJIyH406N3Xg/C5KLJevwQICqYGBrbnn0dBAERpT0KkC8NkD/AqzXIJjIflC2hmslnpIuB
eQBAkMpt4/g592S/0OhSOIHuxDTMLkAvcN4C0BipDRUHhQhlAq9ZFpVBrNiSzQFwSKIcb5LyqSwH
QAoz88p6q30PzEKhcRwkdwdIjFUEkkGGRKxFxfp3NDg9KK2oDhGtoP7GpOjNDkypOSNdj5ODwtMB
FkiEGO/8vSG+AAAAAElFTkSuQmCC
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAjCAYAAACpZEt+AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAACgSURBVDhP3VPbDYAgDOxk3anrdBlHYZSzUBSL
KD/ED0kIpDn6uDsIk0ULAUnBxNAUc3qJTUBEtp8AjoL8HFBIyjz4lq2RtVKLB1nnJY7GRmdOOs+w
yFGBqGga6yFBmcDVa0kZxGpRXwbonFTsJxY9AdmSpkF9le8DLbxML9SFBwOIQApo2GQLlnKhh9uH
iU3XKdqY/om6KfBO1LsaH6i5A0Go0ozyYMc5AAAAAElFTkSuQmCC
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAAjCAYAAABLuFAHAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAEUSURBVEhL1VSBDcQgCHQyd2IdlnEUR+FVRMHS
xqZNmm/yaV85uTuEQA+e8ABL74AzRgoh8C8i5U4pQV+TvfKGxJs9cyJQgCElI2EP5LVMGCNhP5nB
CcZpxoOcBwPGIkWVpIDraUINyCRa3KzSoqSdtDmK9U1aFmspK80zrBknjmj0QtkFl/yueSvlc/Ah
85GyC07gaHYoM7huOBfAyrUuy94713Mp6dbfDzOPTlKm7ayd1HlLbgv6ULNL0lycsy5zaXN/S9+2
LvOmjK+5dJXu6TJlQvCHhGtYGwo9W/322vvC7TmazoDXYChDsc2224ZNAM+1Xc2tTDrbYqCqrWNY
DZ6lqjN9P7MM99EotzT/b2NsMv8BjD9j+GKXsfMAAAAASUVORK5CYII=
)
D.
-
设等比数列{an}中,前n项之和为Sn,已知S3=8,S6=7,则a7+a8+a9=( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAjCAYAAACdHYpiAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADHSURBVEhL7VXRDYUgDOxk3anrdBlGYZSTgj5E
86RC8qLJIyH406N3Xg/C5KLJevwQICqYGBrbnn0dBAERpT0KkC8NkD/AqzXIJjIflC2hmslnpIuB
eQBAkMpt4/g592S/0OhSOIHuxDTMLkAvcN4C0BipDRUHhQhlAq9ZFpVBrNiSzQFwSKIcb5LyqSwH
QAoz88p6q30PzEKhcRwkdwdIjFUEkkGGRKxFxfp3NDg9KK2oDhGtoP7GpOjNDkypOSNdj5ODwtMB
FkiEGO/8vSG+AAAAAElFTkSuQmCC
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAjCAYAAACpZEt+AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAACgSURBVDhP3VPbDYAgDOxk3anrdBlHYZSzUBSL
KD/ED0kIpDn6uDsIk0ULAUnBxNAUc3qJTUBEtp8AjoL8HFBIyjz4lq2RtVKLB1nnJY7GRmdOOs+w
yFGBqGga6yFBmcDVa0kZxGpRXwbonFTsJxY9AdmSpkF9le8DLbxML9SFBwOIQApo2GQLlnKhh9uH
iU3XKdqY/om6KfBO1LsaH6i5A0Go0ozyYMc5AAAAAElFTkSuQmCC
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAAjCAYAAABLuFAHAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAEUSURBVEhL1VSBDcQgCHQyd2IdlnEUR+FVRMHS
xqZNmm/yaV85uTuEQA+e8ABL74AzRgoh8C8i5U4pQV+TvfKGxJs9cyJQgCElI2EP5LVMGCNhP5nB
CcZpxoOcBwPGIkWVpIDraUINyCRa3KzSoqSdtDmK9U1aFmspK80zrBknjmj0QtkFl/yueSvlc/Ah
85GyC07gaHYoM7huOBfAyrUuy94713Mp6dbfDzOPTlKm7ayd1HlLbgv6ULNL0lycsy5zaXN/S9+2
LvOmjK+5dJXu6TJlQvCHhGtYGwo9W/322vvC7TmazoDXYChDsc2224ZNAM+1Xc2tTDrbYqCqrWNY
DZ6lqjN9P7MM99EotzT/b2NsMv8BjD9j+GKXsfMAAAAASUVORK5CYII=
)
D.
-
设等比数列{an}中,前n项之和为Sn,已知S3=8,S6=7,则a7+a8+a9=( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAjCAYAAACdHYpiAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADHSURBVEhL7VXRDYUgDOxk3anrdBlGYZSTgj5E
86RC8qLJIyH406N3Xg/C5KLJevwQICqYGBrbnn0dBAERpT0KkC8NkD/AqzXIJjIflC2hmslnpIuB
eQBAkMpt4/g592S/0OhSOIHuxDTMLkAvcN4C0BipDRUHhQhlAq9ZFpVBrNiSzQFwSKIcb5LyqSwH
QAoz88p6q30PzEKhcRwkdwdIjFUEkkGGRKxFxfp3NDg9KK2oDhGtoP7GpOjNDkypOSNdj5ODwtMB
FkiEGO/8vSG+AAAAAElFTkSuQmCC
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAjCAYAAACpZEt+AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAACgSURBVDhP3VPbDYAgDOxk3anrdBlHYZSzUBSL
KD/ED0kIpDn6uDsIk0ULAUnBxNAUc3qJTUBEtp8AjoL8HFBIyjz4lq2RtVKLB1nnJY7GRmdOOs+w
yFGBqGga6yFBmcDVa0kZxGpRXwbonFTsJxY9AdmSpkF9le8DLbxML9SFBwOIQApo2GQLlnKhh9uH
iU3XKdqY/om6KfBO1LsaH6i5A0Go0ozyYMc5AAAAAElFTkSuQmCC
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAAjCAYAAABLuFAHAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAEUSURBVEhL1VSBDcQgCHQyd2IdlnEUR+FVRMHS
xqZNmm/yaV85uTuEQA+e8ABL74AzRgoh8C8i5U4pQV+TvfKGxJs9cyJQgCElI2EP5LVMGCNhP5nB
CcZpxoOcBwPGIkWVpIDraUINyCRa3KzSoqSdtDmK9U1aFmspK80zrBknjmj0QtkFl/yueSvlc/Ah
85GyC07gaHYoM7huOBfAyrUuy94713Mp6dbfDzOPTlKm7ayd1HlLbgv6ULNL0lycsy5zaXN/S9+2
LvOmjK+5dJXu6TJlQvCHhGtYGwo9W/322vvC7TmazoDXYChDsc2224ZNAM+1Xc2tTDrbYqCqrWNY
DZ6lqjN9P7MM99EotzT/b2NsMv8BjD9j+GKXsfMAAAAASUVORK5CYII=
)
D.
-
设等比数列{an}中,前n项之和为Sn,已知S3=8,S6=7,则a7+a8+a9=( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAjCAYAAACdHYpiAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAC0SURBVEhL7ZXRDcMgDEQ9mXfyOl6GURjlAsYS
JUlbB36K1JMcJUR+weYghEXtBMgKJoZmf3bFAElARCVmAaYE+QO2BpiJqg9aSPLxogczuNcPAJL0
2i7xWuwbfZ3BLdjD3tt1QbsABiONbgwAMpQJ7FlZGcRaRpsCgNMesONNymhTqATzin+13k/shVZG
7cHZW3GACMQgU03sSc36T3pw+aGMTQ3MoCb0ZZxahUUjfdb2AOAASIQY7/4L7ugAAAAASUVORK5C
YII=
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAjCAYAAACpZEt+AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAACdSURBVDhP3ZPRDcMwCESZjJ1Yh2U8ike54jOV
45YmP2k/ehJRQl7MgWPBhe4EukNF4T2fUxNoBhGJ+ARQDfbnAIc05jDDGrPUYYVavwCexqogwOuJ
7gK2Qe3TDKDDVaCZ7a4Q9chOBfCyB/z9LLJTLNEsls6vxn2xF7PM8HB8ObQAMxih0uRKstzm4e3A
7Kazi9Vm2cXFoM71dQB4AEGo0oyaMf33AAAAAElFTkSuQmCC
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAAjCAYAAABLuFAHAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAD2SURBVEhL1ZThDcQgCIWdzJ1Yx2UcxVE4QK1Q
IWmvf9ov8XJpffCgSsIHvEDcSsaUUl+5YBvPK4xnakHt74a4IijBQStYxsZOw5IzlrGxiysc0Qyt
2YAULKskJOZo0xKQhxguLc+0hGlYr2/ZsljLjBEz0jivhpNlZhNHzTtbZnzxlnm3zGziCk7NjmUm
yQvnAGg8y4xj+zpfFc9G3V0ilt8/eZvYHJzolrnifr/niZJb5k0ZwhHTxdDZaMpEQ8K1LUNhZOP/
7ogigoat0RQJmVgMNBQlwO2GLUGfa1drls+ks50aqHAy8+b1qW53+8Ehuc4nxYg/jD9j+Hy7AM8A
AAAASUVORK5CYII=
)
D.
-
设等比数列{an}中,前n项之和为Sn,已知S3=8,S6=7,则a7+a8+a9=( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAjCAYAAACdHYpiAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAC0SURBVEhL7ZXRDcMgDEQ9mXfyOl6GURjlAsYS
JUlbB36K1JMcJUR+weYghEXtBMgKJoZmf3bFAElARCVmAaYE+QO2BpiJqg9aSPLxogczuNcPAJL0
2i7xWuwbfZ3BLdjD3tt1QbsABiONbgwAMpQJ7FlZGcRaRpsCgNMesONNymhTqATzin+13k/shVZG
7cHZW3GACMQgU03sSc36T3pw+aGMTQ3MoCb0ZZxahUUjfdb2AOAASIQY7/4L7ugAAAAASUVORK5C
YII=
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAjCAYAAACpZEt+AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAACdSURBVDhP3ZPRDcMwCESZjJ1Yh2U8ike54jOV
45YmP2k/ehJRQl7MgWPBhe4EukNF4T2fUxNoBhGJ+ARQDfbnAIc05jDDGrPUYYVavwCexqogwOuJ
7gK2Qe3TDKDDVaCZ7a4Q9chOBfCyB/z9LLJTLNEsls6vxn2xF7PM8HB8ObQAMxih0uRKstzm4e3A
7Kazi9Vm2cXFoM71dQB4AEGo0oyaMf33AAAAAElFTkSuQmCC
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAAjCAYAAABLuFAHAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAD2SURBVEhL1ZThDcQgCIWdzJ1Yx2UcxVE4QK1Q
IWmvf9ov8XJpffCgSsIHvEDcSsaUUl+5YBvPK4xnakHt74a4IijBQStYxsZOw5IzlrGxiysc0Qyt
2YAULKskJOZo0xKQhxguLc+0hGlYr2/ZsljLjBEz0jivhpNlZhNHzTtbZnzxlnm3zGziCk7NjmUm
yQvnAGg8y4xj+zpfFc9G3V0ilt8/eZvYHJzolrnifr/niZJb5k0ZwhHTxdDZaMpEQ8K1LUNhZOP/
7ogigoat0RQJmVgMNBQlwO2GLUGfa1drls+ks50aqHAy8+b1qW53+8Ehuc4nxYg/jD9j+Hy7AM8A
AAAASUVORK5CYII=
)
D.
-
设等比数列{an}中,前n项之和为Sn,已知S3=8,S6=7,则a7+a8+a9=( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAjCAYAAACdHYpiAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADHSURBVEhL7VXRDYUgDOxk3anrdBlGYZSTgj5E
86RC8qLJIyH406N3Xg/C5KLJevwQICqYGBrbnn0dBAERpT0KkC8NkD/AqzXIJjIflC2hmslnpIuB
eQBAkMpt4/g592S/0OhSOIHuxDTMLkAvcN4C0BipDRUHhQhlAq9ZFpVBrNiSzQFwSKIcb5LyqSwH
QAoz88p6q30PzEKhcRwkdwdIjFUEkkGGRKxFxfp3NDg9KK2oDhGtoP7GpOjNDkypOSNdj5ODwtMB
FkiEGO/8vSG+AAAAAElFTkSuQmCC
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAjCAYAAACpZEt+AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAACgSURBVDhP3VPbDYAgDOxk3anrdBlHYZSzUBSL
KD/ED0kIpDn6uDsIk0ULAUnBxNAUc3qJTUBEtp8AjoL8HFBIyjz4lq2RtVKLB1nnJY7GRmdOOs+w
yFGBqGga6yFBmcDVa0kZxGpRXwbonFTsJxY9AdmSpkF9le8DLbxML9SFBwOIQApo2GQLlnKhh9uH
iU3XKdqY/om6KfBO1LsaH6i5A0Go0ozyYMc5AAAAAElFTkSuQmCC
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAAjCAYAAABLuFAHAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAEUSURBVEhL1VSBDcQgCHQyd2IdlnEUR+FVRMHS
xqZNmm/yaV85uTuEQA+e8ABL74AzRgoh8C8i5U4pQV+TvfKGxJs9cyJQgCElI2EP5LVMGCNhP5nB
CcZpxoOcBwPGIkWVpIDraUINyCRa3KzSoqSdtDmK9U1aFmspK80zrBknjmj0QtkFl/yueSvlc/Ah
85GyC07gaHYoM7huOBfAyrUuy94713Mp6dbfDzOPTlKm7ayd1HlLbgv6ULNL0lycsy5zaXN/S9+2
LvOmjK+5dJXu6TJlQvCHhGtYGwo9W/322vvC7TmazoDXYChDsc2224ZNAM+1Xc2tTDrbYqCqrWNY
DZ6lqjN9P7MM99EotzT/b2NsMv8BjD9j+GKXsfMAAAAASUVORK5CYII=
)
D.