已知數(shù)列{an}的前n項(xiàng)和為Sn,a1=1且2nSn+1-2(n+1)Sn=n(n+1),數(shù)列{bn}前n項(xiàng)和Pn,且滿足Pn=2?3n-1-23(n∈N*).
(1)求數(shù)列{an},{bn}的通項(xiàng)公式an和bn;
(2)求數(shù)列{anbn}的前n項(xiàng)的和Mn;
(3)令cn=an+2an+anan+2,記{cn}的前n項(xiàng)和為Tn,對(duì)?n∈N*,均有Tn-2n∈[a,b],求b-a的最小值.
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【考點(diǎn)】錯(cuò)位相減法.
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發(fā)布:2024/8/9 8:0:9組卷:137引用:2難度:0.4
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