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已知数列{an}满足a1=2,且an=.(1)求数列{an}的通项公式;(2)对一切正整数...
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已知数列{a
n}满足a
1=2,且a
n=
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)
.
(1)求数列{a
n}的通项公式;
(2)对一切正整数n,令S
n=a
1a
2+a
2a
3+…+a
na
n+1,求S
n.
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