题目内容
【题目】已知等差数列{an}满足a1=1,an+2﹣an=6,则a11等于( )
A.31
B.32
C.61
D.62
【答案】A
【解析】解:∵等差数列{an}满足a1=1,an+2﹣an=6, ∴a3=6+1=7,
a5=6+7=13,
a7=6+13=19,
a9=6+19=25,
a11=6+25=31.
故选:A.
由等差数列的性质依次求出a3 , a5 , a7 , a9 , a11 .
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题目内容
【题目】已知等差数列{an}满足a1=1,an+2﹣an=6,则a11等于( )
A.31
B.32
C.61
D.62
【答案】A
【解析】解:∵等差数列{an}满足a1=1,an+2﹣an=6, ∴a3=6+1=7,
a5=6+7=13,
a7=6+13=19,
a9=6+19=25,
a11=6+25=31.
故选:A.
由等差数列的性质依次求出a3 , a5 , a7 , a9 , a11 .