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已知等差数列{an}的公差为2,其前n项和Sn=pn2+2n(n∈N*).(I)求p的值及...
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已知等差数列{a
n}的公差为2,其前n项和S
n=pn
2+2n(n∈N
*).
(I)求p的值及a
n;
(II)若
,记数列{b
n}的前n项和为T
n,求使
成立的最小正整数n的值.
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已知等差数列{an}的公差为2,其前n项和Sn=pn2+2n(n∈N*).
(I)求p的值及an;
(II)若,记数列{bn}的前n项和为Tn,求使成立的最小正整数n的值.
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已知等差数列{an}的公差为2,其前n项和Sn=pn2+2n(n∈N*).
(I)求p的值及an;
(II)若,记数列{bn}的前n项和为Tn,求使成立的最小正整数n的值.
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已知等差数列{an}的公差为2,其前n项和Sn=pn2+2n(n∈N*).
(I)求p的值及an;
(II)若,记数列{bn}的前n项和为Tn,求使成立的最小正整数n的值.
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(Ⅰ)求的q值;
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已知等差数列{an}的前n项和为Sn=pn2-2n+q(p,q∈R),n∈N+.
(Ⅰ)求的q值;
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已知等差数列{an}的前n项和为Sn=pn2-2n+q(p,q∈R),n∈N+.
(Ⅰ)求的q值;
(Ⅱ)若a1与a5的等差中项为18,bn满足an=2log2bn,求数列{bn}的前n和Tn.
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已知等差数列{an}的前n项和为Sn=pn2-2n+q(p,q∈R),n∈N+.
(Ⅰ)求的q值;
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已知等差数列{an}的前n项和为Sn=pn2-2n+q(p,q∈R),n∈N+.
(Ⅰ)求的q值;
(Ⅱ)若a1与a5的等差中项为18,bn满足an=2log2bn,求数列{bn}的前n和Tn.