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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.
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jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAFlSURBVFhH7ZaBEYMgDEWZjJ1Yh2UYxVFoIloI
oiRCS+3Bne2dBnz8hB+Vf8hQD+H0E5SVqcV6rbS3Sz16nKLOeKUUXL8OuorovJmg9XISRExFBWKx
Qv9eUbQM41ha9AkqK+rM0bKijyKktp5479vrwO/yZ62kq9mjj4aL6rN4q+m9AIqTchC8956NO4cF
B6q9gjqT7wjYnSPqLlb3V7WWlaQUARTVMvBbGV+v3y3TG5sCOVlKlVSv7a39eaxVxUopqdf21+8H
qPRPVw+gGj6vGKAYXC+N/aXt20hXSEBrqS95Wgnmk6BoNtthKn8TYlkQR4J6vnIohO074kE/tSc8
PMcaOi8BMSSnmVB7ojZwRxExJKuZYH3GTF+30DvUjDn1ZnLWQvfFO9sQgzmEZM2k5Nm9q5/NlgZy
msl4UGYWB4PymgmqPxSU20yGgoqbya3qb5wkbSZDFZXudWiNSmAnqEQtTuwLRB/Vs2uCqy0AAAAA
SUVORK5CYII=
)
B.
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADwAAAAjCAYAAADIfGk8AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAGiSURBVGhD7ZfZlcMgDEWpjJ5oh2YohVIYZOLY
BDASYknG9jlOflh0pafFwt3sETfjdQ8wOeJWOymk05a8c8kGXoSNckII/94FeIuRceoBXqJW1KU8
ST8RRjl56aInwnT3/3LRgjajDJH5e4GNStvlIWmAldqR5odt6IA+HF6yr4iuzS5/zwLehsR+67SM
7QrAYDgVtoex3DPA7reXQWkeOvF6rMAN2KhF0WECW2MiRVot8yo9paoHBg8o//sPnlIN2lIvMAof
3qxXIOp7bib/E5K15f6yUo9cFkUZVAJedIbPoyVPlM+fFgRg6T/pmoGpULuDqPtw6wHoKi1PwCVJ
4y7CrxoJnOu3sWUnSc/8vAPo3g+kZFRSfE1KS8xRmHlt6bLpx2gjYPOFLSPtuC29Bg9qa0I1/QA9
AhavFJDzMWI2j5bopo+3bMDK0mi5X3VZ2iv2NH14DGA8HZnry92qyK+Mp32AOcoYG+Tk9A7AtaY/
mag2IXLNqTd97g1997MijGv6fQ3mntYMjG76XAs7728G7mzHtOMe4GmuXnTR7SL8BxsWeWG7ogb+
AAAAAElFTkSuQmCC
)
C.
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADwAAAAjCAYAAADIfGk8AAAAAXNSR0IArs4c6QAAAARnQU1BAACx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=
)
D.(-1,-1)
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,
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