已知各项均为正数的数列{an}的前n项和Sn满足S1>1,且6Sn=(an+1)(an+2),n∈N+1.设数列{bn}满足an((2^bn)-1)=1,并记Tn为{bn}的前n项和,求证:3Tn+1>log2(an+3),n∈N+.请一定要详细作答an((2^bn)-1)=1为an乘(2的bn次方-1

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/05 05:08:55
已知各项均为正数的数列{an}的前n项和Sn满足S1>1,且6Sn=(an+1)(an+2),n∈N+1.设数列{bn}满足an((2^bn)-1)=1,并记Tn为{bn}的前n项和,求证:3Tn+1>log2(an+3),n∈N+.请一定要详细作答an((2^bn)-1)=1为an乘(2的bn次方-1

已知各项均为正数的数列{an}的前n项和Sn满足S1>1,且6Sn=(an+1)(an+2),n∈N+1.设数列{bn}满足an((2^bn)-1)=1,并记Tn为{bn}的前n项和,求证:3Tn+1>log2(an+3),n∈N+.请一定要详细作答an((2^bn)-1)=1为an乘(2的bn次方-1
已知各项均为正数的数列{an}的前n项和Sn满足S1>1,且6Sn=(an+1)(an+2),n∈N+
1.设数列{bn}满足an((2^bn)-1)=1,并记Tn为{bn}的前n项和,求证:3Tn+1>log2(an+3),n∈N+.
请一定要详细作答
an((2^bn)-1)=1为an乘(2的bn次方-1的差)=1
log2(an+3)为以2为底,an+3为真数的对数.
555Alan555的看不懂.麻烦详解.

已知各项均为正数的数列{an}的前n项和Sn满足S1>1,且6Sn=(an+1)(an+2),n∈N+1.设数列{bn}满足an((2^bn)-1)=1,并记Tn为{bn}的前n项和,求证:3Tn+1>log2(an+3),n∈N+.请一定要详细作答an((2^bn)-1)=1为an乘(2的bn次方-1
6S(n+1)-6Sn=6a(n+1)=【a(n+1)+1】【a(n+1)+2】-(an+1)(an+2).
化简得【a(n+1)+an】【a(n+1)-an-3】=0.
因各项均为正数,故a(n+1)-an-3=0,即a(n+1)-an=3.
6S1=(a1+1)(a1+2)=6a1.解得a1=1或a1=2
因S1=a1>1,故a1=2.
故an=3n-1.

6Sn=(an+1)(an+2)①
6S(n-1)=(a(n-1)+1)(a(n-1)+2)②
①-② 整理得 an-a(n-1)=3
6S1=an^2+3an+2 得a1=2 an=3n-1
an((2^bn)-1)=1 看不懂,麻烦做详细说明

100

Crisp red hands, yellow vine wine, the city is springtime in the palace wall Liu;
wind evil, Huan love thin,
a pregnant melancholy,louboutin sale, a few years away from the cable,
wr...

全部展开

Crisp red hands, yellow vine wine, the city is springtime in the palace wall Liu;
wind evil, Huan love thin,
a pregnant melancholy,louboutin sale, a few years away from the cable,
wrong, wrong, wrong.
spring, such as old people thin air, tears of red-eup shark raw silk through;
peach drop, leisure pool House,christian louboutin flats sale,
Although Mountain League,louboutin shoes, Kam book difficult to care,
Mo, Mo, Mo.
the world situation is thin, human evil, and the rain fall easily get to spend the evening;
night wind dried tears disabled, wish to transfer their minds, Du Yi oblique bar
difficult, difficult,christian louboutin shoe sale, difficult.
people into all, this non-yesterday, the sick soul seems often swing rope;
horn sound cold, night and felt discouraged, worried about being asked, pharyngeal tears installed Huan, conceal, conceal, conceal

相关的主题文章:


Events (121)

Recite

Girl to break her boyfriend of 11 text messages (I cried)

收起