搜搜考试网设数列{an}和{bn}满足a1=b1=6,a2=b2=4,a3=b3=3 ,且数列{an+1-an}是等差数列,{bn
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设数列{an}和{bn}满足a1=b1=6,a2=b2=4,a3=b3=3 ,且数列{an+1-an}是等差数列,{bn-2}是等比数列
(1)求列数{an}和{bn}的通项公=式
(2)设{nbn}的前n项和为Sn,求Sn的表达式
(3)数列{Cn}满足Cn=an*(bn+2-2),求数列{Cn}的最大项
(1)求列数{an}和{bn}的通项公=式
(2)设{nbn}的前n项和为Sn,求Sn的表达式
(3)数列{Cn}满足Cn=an*(bn+2-2),求数列{Cn}的最大项
（1）an=(n-6)(n-1)/2+6
bn=2^(3-n)+2
(2) sn=(n-4)*2^(2-n)+n(n+1)+16
(3) cn=[(n-6)(n-1)/2+6]*2^(1-n)
=(n^2-7n+18)/2^n
我只能做到这一步了,接下来得靠楼主自己了
bn=2^(3-n)+2
(2) sn=(n-4)*2^(2-n)+n(n+1)+16
(3) cn=[(n-6)(n-1)/2+6]*2^(1-n)
=(n^2-7n+18)/2^n
我只能做到这一步了,接下来得靠楼主自己了
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