取等于不超過的最大整數(shù).則當(dāng)時(shí)..-9′ 查看更多

 

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若有窮數(shù)列a1,a2…an(n是正整數(shù)),滿足a1=an,a2=an-1…an=a1即ai=an-I+1(i是正整數(shù),且1≤i≤n),就稱該數(shù)列為“對(duì)稱數(shù)列”.

(1)已知數(shù)列{bn}是項(xiàng)數(shù)為7的對(duì)稱數(shù)列,且b1,b2,b3,b4成等差數(shù)列,b1=2,b4=11,試寫出{bn}的每一項(xiàng)

(2)已知{cn}是項(xiàng)數(shù)為2k-1(k≥1)的對(duì)稱數(shù)列,且ck,ck+1…c2k-1構(gòu)成首項(xiàng)為50,公差為-4的等差數(shù)列,數(shù)列{cn}的前2k-1項(xiàng)和為S2k-1,則當(dāng)k為何值時(shí),S2k-1取到最大值?最大值為多少?

(3)對(duì)于給定的正整數(shù)m>1,試寫出所有項(xiàng)數(shù)不超過2 m的對(duì)稱數(shù)列,使得1,2,22…2m-1成為數(shù)列中的連續(xù)項(xiàng);當(dāng)m>1500時(shí),試求其中一個(gè)數(shù)列的前2008項(xiàng)和S2008

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20、若有窮數(shù)列a1,a2…an(n是正整數(shù)),滿足a1=an,a2=an-1…an=a1即ai=an-i+1
(i是正整數(shù),且1≤i≤n),就稱該數(shù)列為“對(duì)稱數(shù)列”.
(1)已知數(shù)列{bn}是項(xiàng)數(shù)為7的對(duì)稱數(shù)列,且b1,b2,b3,b4成等差數(shù)列,b1=2,b4=11,試寫出{bn}的每一項(xiàng)
(2)已知{cn}是項(xiàng)數(shù)為2k-1(k≥1)的對(duì)稱數(shù)列,且ck,ck+1…c2k-1構(gòu)成首項(xiàng)為50,公差為-4的等差數(shù)列,數(shù)列{cn}的前2k-1項(xiàng)和為S2k-1,則當(dāng)k為何值時(shí),S2k-1取到最大值?最大值為多少?
(3)對(duì)于給定的正整數(shù)m>1,試寫出所有項(xiàng)數(shù)不超過2m的對(duì)稱數(shù)列,使得1,2,22…2m-1成為數(shù)列中的連續(xù)項(xiàng);當(dāng)m>1500時(shí),試求其中一個(gè)數(shù)列的前2008項(xiàng)和S2008

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若有窮數(shù)列a1,a2…an(n是正整數(shù)),滿足a1=an,a2=an-1…an=a1即ai=an-i+1
(i是正整數(shù),且1≤i≤n),就稱該數(shù)列為“對(duì)稱數(shù)列”.
(1)已知數(shù)列{bn}是項(xiàng)數(shù)為7的對(duì)稱數(shù)列,且b1,b2,b3,b4成等差數(shù)列,b1=2,b4=11,試寫出{bn}的每一項(xiàng)
(2)已知{cn}是項(xiàng)數(shù)為2k-1(k≥1)的對(duì)稱數(shù)列,且ck,ck+1…c2k-1構(gòu)成首項(xiàng)為50,公差為-4的等差數(shù)列,數(shù)列{cn}的前2k-1項(xiàng)和為S2k-1,則當(dāng)k為何值時(shí),S2k-1取到最大值?最大值為多少?
(3)對(duì)于給定的正整數(shù)m>1,試寫出所有項(xiàng)數(shù)不超過2m的對(duì)稱數(shù)列,使得1,2,22…2m-1成為數(shù)列中的連續(xù)項(xiàng);當(dāng)m>1500時(shí),試求其中一個(gè)數(shù)列的前2008項(xiàng)和S2008

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若有窮數(shù)列a1,a2…an(n是正整數(shù)),滿足a1=an,a2=an-1…an=a1即ai=an-i+1
(i是正整數(shù),且1≤i≤n),就稱該數(shù)列為“對(duì)稱數(shù)列”.
(1)已知數(shù)列{bn}是項(xiàng)數(shù)為7的對(duì)稱數(shù)列,且b1,b2,b3,b4成等差數(shù)列,b1=2,b4=11,試寫出{bn}的每一項(xiàng)
(2)已知{cn}是項(xiàng)數(shù)為2k-1(k≥1)的對(duì)稱數(shù)列,且ck,ck+1…c2k-1構(gòu)成首項(xiàng)為50,公差為-4的等差數(shù)列,數(shù)列{cn}的前2k-1項(xiàng)和為S2k-1,則當(dāng)k為何值時(shí),S2k-1取到最大值?最大值為多少?
(3)對(duì)于給定的正整數(shù)m>1,試寫出所有項(xiàng)數(shù)不超過2m的對(duì)稱數(shù)列,使得1,2,22…2m-1成為數(shù)列中的連續(xù)項(xiàng);當(dāng)m>1500時(shí),試求其中一個(gè)數(shù)列的前2008項(xiàng)和S2008

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若有窮數(shù)列a1,a2…an(n是正整數(shù)),滿足a1=an,a2=an-1…an=a1即ai=an-i+1
(i是正整數(shù),且1≤i≤n),就稱該數(shù)列為“對(duì)稱數(shù)列”.
(1)已知數(shù)列{bn}是項(xiàng)數(shù)為7的對(duì)稱數(shù)列,且b1,b2,b3,b4成等差數(shù)列,b1=2,b4=11,試寫出{bn}的每一項(xiàng)
(2)已知{cn}是項(xiàng)數(shù)為2k-1(k≥1)的對(duì)稱數(shù)列,且ck,ck+1…c2k-1構(gòu)成首項(xiàng)為50,公差為-4的等差數(shù)列,數(shù)列{cn}的前2k-1項(xiàng)和為S2k-1,則當(dāng)k為何值時(shí),S2k-1取到最大值?最大值為多少?
(3)對(duì)于給定的正整數(shù)m>1,試寫出所有項(xiàng)數(shù)不超過2m的對(duì)稱數(shù)列,使得1,2,22…2m-1成為數(shù)列中的連續(xù)項(xiàng);當(dāng)m>1500時(shí),試求其中一個(gè)數(shù)列的前2008項(xiàng)和S2008

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