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已知数列{an}是一个等差数列,且a2=1,a5=-5.(I)求{an}的通项an;(II...
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已知数列{a
n}是一个等差数列,且a
2=1,a
5=-5.
(I)求{a
n}的通项a
n;
(II)设
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAD8AAAAqCAYAAAAERIP3AAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
,
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADkAAAAnCAYAAAC1xOBuAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
,求T=log
2b
1+log
2b
2+log
2b
3+…+log
2b
n的值.
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