Sn |
Tn |
7n+1 |
4n+27 |
an |
bn |
S2n-1 |
T2n-1 |
a11 |
b11 |
2a11 |
2b11 |
a1+a21 |
b1+b21 |
| ||
|
s21 |
T21 |
a11 |
b11 |
7×21+1 |
4×21+27 |
4 |
3 |
4 |
3 |
A.4 | B.5 | C.8 | D.10 |
an |
a2012-n |
x2 |
a2 |
y2 |
b2 |
π |
2 |
A.3 | B.4 | C.5 | D.6 |
1 | ||
|
A.公差为正数的等差数列 | B.公差为负数的等差数列 |
C.公比为正数的等比数列 | D.公比为负数的等比数列 |
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