1 |
a1 |
1 |
a2 |
1 |
a3 |
1 |
an |
1 |
an |
1 |
q |
|
1 |
a1 |
1-
| ||
1-
|
1 |
a12qn-1 |
a1(1-qn) |
1-q |
Sn |
a12qn-1 |
Sn |
Wn |
S15 |
W15 |
S15 |
W15 |
15×10 | ||
15×
|
s1+s2+…+sn |
n |
A.2008 | B.2009 | C.2010 | D.2011 |
2x+3 |
3x |
1 |
an |
1 |
an-1an |
m-2002 |
2 |
1 |
(n+1)m+1 |
1 |
(n+1)m+1 |
1 |
22 |
1 |
23 |
1 |
24 |
1 |
32 |
1 |
33 |
1 |
34 |
1 |
(n+1)2 |
1 |
(n+1)3 |
1 |
(n+1)4 |
1 |
2 |
n+1 |
n+2 |
A.有最小值63 | B.有最大值63 | C.有最小值31 | D.有最大值31 |
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