1,sn=2an-2,sn-1=2(an-1)-2,两式相减得,an=2(an-1),n大于1,又因为a1=2a1-2,得a1=2,所以an=2n.把P代入直线,得(bn+1)=bn+2,诶,b1求不出来诶,题目少条件的额
一道错位相减的数学题已知数列an的前n项和为Sn,且Sn=2an-2(n=1,2,3,…),数列bn中,点P(bn,bn
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