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【单选题】
等差数列a
n
)中,a
5
<O.a
6
>0,且a
6
>|a
5
|,S
n
是前n项之和.则().
A.S
1
,S
2
,S
3
均小于0,而S
4
,S
5
,…均大于0
B.S
1
,S
2
,…,S
5
均小于0,而S
6
,S
7
,…均大于0
C.S
1
,S
2
,…,S
9
均小于0,而S
10
,S
11
,…,均大于0
D.S
1
,S
2
,…,S
10
均小于0.而S
11
,S
12
.…均大于0
E.以上结论均不正确
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