Sn+1+Sn=2an-1 a1=3

a1=1,Sn=2an+1求Sna1=1,Sn=2an+1求Sna1=1,Sn=2an+1求Sna(n)=S(n)-S(n-1)=2*a(n)+1-(2*a(n-1)+1)=2*a(n)-2*a(n-

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数列an中,a1=1,sn+1=sn-1/2an,则an=?数列an中,a1=1,sn+1=sn-1/2an,则an=?数列an中,a1=1,sn+1=sn-1/2an,则an=?s(n+1)=sn-

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高二数学数列求和问题!在数列an中,a1=1,Sn为an前n项和,an=S(n-1)求Sn,an请帮我看看我分别先算Sn和an哪里出错了?1.先算Sn因为an=2Sn-1且an=Sn-Sn-1所以Sn

a1=1,Sn=n^2an,求ana1=1,Sn=n^2an,求ana1=1,Sn=n^2an,求anSn-S(n-1)=An,n^2An-(n-1)^2a(n-1)=An(n^2-1)An=(n-1

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a1=1/2,Sn=n^2an-n(n-1),求Sn和ana1=1/2,Sn=n^2an-n(n-1),求Sn和ana1=1/2,Sn=n^2an-n(n-1),求Sn和an因an=Sn-S(n-1)

数列｛an｝,中,a1=1/3,设Sn为数列｛an｝的前n项和,Sn=n（2n-1）an求Sn数列｛an｝,中,a1=1/3,设Sn为数列｛an｝的前n项和,Sn=n（2n-1）an求Sn数列｛an｝

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Sn=n（2n-1）ana1=1/3求数列的Sn,anSn=n（2n-1）ana1=1/3求数列的Sn,anSn=n（2n-1）ana1=1/3求数列的Sn,an当n=1时,可知S1=a1=1/3.当

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已知a1=3,an=Sn-1+2^n(n大于等于2）,求an,Sn?已知a1=3,an=Sn-1+2^n(n大于等于2）,求an,Sn?已知a1=3,an=Sn-1+2^n(n大于等于2）,求an,S

a1=3,an=Sn-1+2n次方.n大于或等于2.求an和Sna1=3,an=Sn-1+2n次方.n大于或等于2.求an和Sna1=3,an=Sn-1+2n次方.n大于或等于2.求an和Sn为表达清

a1=3,an=Sn-1+2的n次方.n大于或等于2.求an和Sna1=3,an=Sn-1+2的n次方.n大于或等于2.求an和Sna1=3,an=Sn-1+2的n次方.n大于或等于2.求an和Sna

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已知数列an前n项和为Sn,a1=1,Sn=2a(n+1),求Sn已知数列an前n项和为Sn,a1=1,Sn=2a(n+1),求Sn已知数列an前n项和为Sn,a1=1,Sn=2a(n+1),求Sn由