设数列An,Bn满足a1=b1=6,a2=b2=4,a3=b3=3,且数列A(n+1)-An(n属于正整数)是等差数列 数列(Bn)-2是等比数列（1）求数列An,Bn的通项公式（2）是否存在K属于正整数,使Ak-Bk属于(0,1/2)?若存在求出K；若不存在

设数列{an}{bn}满足a1=b1=6 a2=b2=4 a3=b3=3若{an+1 - an}为等差数列.{bn+1 -bn}为等比数列.分别求{an}{bn}的通项公式. 设数列{an}和{bn}满足:a1=b1=6,a2=b2=4,a3=b3=3,数列{an+1-an}是等差数列···设数列{an}和{bn}满足:a1=b1=6,a2=b2=4,a3=b3=3,数列{an+1-an}是等差数列,Sn为数列{bn}的前n项和,且Sn=2n-bn+10,(1)分别求{an}{bn}的通项公式(2 设各项均为正数的数列{an}和{bn}满足:an,bn,an+1成等差数列,bn,an+1,bn+1等比数列且a1=1,b1=2,a2=3求通项an,bn 设各项均为正数的数列｛an}和｛bn}满足：an,bn,an+1成等差数列,bn,an+1,bn+1成等比数列,且a1=1,b1=2,a2=3,求通项an,bn 设数列An,Bn 满足a1=b1=6,a2=b2=4,a3=b3=3设数列An,Bn 满足a1=b1=6,a2=b2=4,a3=b3=3,若{an+1 -an}是等差数列,{bn+1-bn}是等比数列.1.求An Bn 通项2.求数列AN最小项及最小值3.是否存在K属于N*,使ak-bk属于（0.0.5）若存 设数列{an}和{bn}满足a1=b1=6,a2=b2=4,a3=b3=3 ,且数列{an+1-an}是等差数列设数列{an}和{bn}满足a1=b1=6,a2=b2=4,a3=b3=3 ,且数列{a(n+1)-an}是等差数列,{bn-2}是等比数列(2)设{nbn}的前n项和为Sn,求Sn的表达式(3)数列{C 设数列An,Bn满足a1=b1=6,a2=b2=4,a3=b3=3,且数列A(n+1)-An(n属于正整数)是等差数列.设数列An,Bn满足a1=b1=6,a2=b2=4,a3=b3=3,且数列A(n+1)-An(n属于正整数)是等差数列,sn为数列｛BN}的前几项和,且sn=2n-bn+101）求数 设数列an为等比数列,数列bn满足bn=na1+(n-1)a2+...+2an-1+an已知b1=1,b2=4第一问为什么可以“由已知b1=a1” 设数列an,bn分别满足a1*a2*a3...*an=1*2*3*4...*n,b1+b2+b3+...bn=an^2,n属于N+a1*a2*a3...*an=1*2*3*4...*n,b1+b2+b3+...bn=an^2,n属于N+1)求数列an和bn的通项公式 设各项均为正数的数列{an}和{bn}满足5^[an ],5^[bn] ,5^[a(n+1)] .设各项均为正数的数列{an}和{bn}满足5^[an ],5^[bn] ,5^[a(n+1)] 成等比数列,lg[bn],lg[a(n+1)],lg[bn+1]成等差数列,且a1=1,b1=2,a2=3,求通项an、bn. 设数列an与数列bn满足a1=b1=1,bn/an=1/a1 +1/a2+……+1/an-1,求证:设（1+1/b1)(1+1/b2)……(1+1/bn)=入(1/a1+1/a2+……1/an).求实数入的值老师说用数学归纳法，怎么证明 等差等比数列应用设数列{An}和{Bn}满足A1=B1=6,A2=B2=4,A3=B3=3,且数列{A（n+1）-An}是等差数列,数列{Bn-2}是等比数列（1）设,求数列{Cn}的通项公式（2）求数列{An}和{Bn}的通项公式 数列an满足,a1=1/4,a2=3/4,an+1=2an-an-1(n≥2,n属于N*),数列bn满足b1 设数列{an}和{bn}满足a1=b1=6,a2=b2=3,且数列{a(n+1)-an}是等差数列,数列{bn-2}是等比数列1 求数列{an}和{bn}的通项公式2 是否存在k属于正整数,使ak-bk属于（0,1/2）?若存在,求出k,若不存在,为什么? Help!Help!Help!Help!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（n是正整数）数列｛bn -2)是等比数列（n是正整数）（1）求｛an｝,｛bn｝的通项公式；（2）是否存在 已知数列an满足an=31-6n,数列bn满足bn=(a1+a2+...+an)/n,求数列bn的前20项之和. 设数列｛an｝和｛bn｝都是等差数列,且a1=25,b1=75,a2+b2=100,那么数列｛an+bn}的第37项为? 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