> 数学 >
{an},{bn}均为等差数列,前n项和分别为SnTn
an
bn
3n+7
4n+1
,则
S11
T11
=(  )
A.
22
21

B. 1
C.
8
9

D.
14
17
人气:422 ℃ 时间:2020-03-28 06:00:42
解答
S11
T11
11(a1+a11)
2
11(b1+b11)
2
=
a1+a11
b1+b11
=
2a6
2b6
=
25
25
=1
故选B
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