已知数列an,a1=1,2an=2a(n-1)【←下标】-1,n大于等于2,求an
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已知数列an,a1=1,2an=2a(n-1)【←下标】-1,n大于等于2,求an
已知数列an,a1=1,2an=2a(n-1)【←下标】-1,n大于等于2,求an
已知数列an,a1=1,2an=2a(n-1)【←下标】-1,n大于等于2,求an
您表述的题目很清楚!
n≥2时,使用递推
2an=2a(n-1)-1
=2a(n-2)-1-1
=...
=2a1-(n-1)
=3-n
an=(3-n)/2
如果认为讲解不够清楚,
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