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已知等差数列{an}的前n项的和为Sn,且S2=10,S5=55,则过点P(n,an)和Q...
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已知等差数列{a
n}的前n项的和为S
n,且S
2=10,S
5=55,则过点P(n,a
n)和Q(n+2,a
n+2)(n∈N
*)的直线的一个方向向量的坐标是( )
A.
B.
C.
D.(-1,-1)
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