1 |
x |
3 |
2 |
1 |
an |
1 |
an |
4 |
3 |
5 |
4 |
6 |
5 |
n+2 |
n+1 |
1 |
am |
1 |
am |
3 |
2 |
m+1 |
m+2 |
m+2 |
m+1 |
5m+8 |
2(m+2) |
2(m+2) |
m+1 |
1 |
an |
A.等差非等比数列 | B.等比非等差数列 |
C.既是等比又是等差数列 | D.既非等差又非等比数列 |
A.a1+a11>0 | B.a2+a10<0 | C.a3+a9=0 | D.a6=6 |
S2007 |
2007 |
S2005 |
2005 |
an |
a2n |
A.1 | B.{1,
| C.{
| D.{0,
|
A.100 | B.50 | C.25 | D.10 |
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