已知等比数列｛Xn｝的各项为不等于1的正数,数列｛Yn｝满足Yn=2㏒aXn(a>0,a≠1),设γ4=17,γ7=11

已知等比数列｛Xn｝的各项为不等于1的正数,数列｛Yn｝满足Yn=2㏒aXn(a>0,a≠1),设γ4=17,γ7=11 已知等比数列xn的各项都为不等于1的正数,x1=a^11,x3=a^9,数列yn满足ynlogxn a=2（其中n、xn 等比数列xn各项均为正数,yn=2logaXn,a＞0且a不等于1,n属于正整数.已知Y4等于17y五等于11求数列yn 已知等比数列Xn的各项均为正数,数列Yn满足Yn=logaXn,（a>0,a不等於0）且Y3=18,Y6=12,证明Yn 已知数列{Xn}满足Xn+1=Xn^2+Xn,X1=a(a-1),数列{Yn}满足Yn=1/(Xn+1),设Pn=X/( X1=a>0,Y1=b>0,Xn+1=(Xn+Yn)/2,Yn+1=(Xn*Yn)^1/2,求证数列Xn,Yn收敛并求其 设{xn}是各项都为正数的等比数列,{yn}是等差数列,且x1=y1=1,x3+y5=13,x5+y3=21 设Xn是各项都为正数的等比数列,Yn是等差数列,且X1=Y1=1,X3+Y5=13,X5+Y3=21 大一高数问题:已知数列Yn有极限,且满足Yn+1(小1小n)=根号下2+Yn,则Yn的极限为? 设Xn≤a≤Yn,lim(n→∞)（Yn-Xn）=0,则Xn与Yn的收敛? 已知各项都是正数的等比数列{Xn},满足(Xn)^an=(Xn+1)^an+1=(Xn+2)an+2.证明数列{ 设Xn≤a≤Yn,lim(n→∞)《Yn-Xn》=0,则Xn与Yn