一个无穷等比数列an,前n项和为Sn,lim(趋向于无穷)Sn=6,a1+a2=16/3,则a1=
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一个无穷等比数列an,前n项和为Sn,lim(趋向于无穷)Sn=6,a1+a2=16/3,则a1=
一个无穷等比数列an,前n项和为Sn,lim(趋向于无穷)Sn=6,a1+a2=16/3,则a1=
一个无穷等比数列an,前n项和为Sn,lim(趋向于无穷)Sn=6,a1+a2=16/3,则a1=
lim(趋向于无穷)Sn=a1/(1-q)=6,a1+a2=a1+a1*q=16/3
解得a1=4
lim(趋向于无穷)Sn=1/(1-q)=6,q=5/6,
a1+a2=a1+(5/6)a1=16/3,
a1=16/3-a2
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