试题与答案

若等差数列{an}的前三项为x-1,x+1,2x+3,则这数列的通项公式为( )

题型:选择题

题目:

若等差数列{an}的前三项为x-1,x+1,2x+3,则这数列的通项公式为(  )

A.an=2n-5

B.an=2n-3

C.an=2n-1

D.an=2n+1

答案:

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