摘要:(II)若.求
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若数列{an}的前n项和为Sn,a1=2且Sn+1=4an-2(n=1,2,3…).
(I)求a2,a3;
(II)求证:数列{an-2an-1}是常数列;
(III)求证:
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+…+
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(I)求a2,a3;
(II)求证:数列{an-2an-1}是常数列;
(III)求证:
a1-1 |
a2-1 |
a2-1 |
a3-1 |
an-1 |
an+1-1 |
n |
2 |