等差数列{an}中,a2=9,a5=33,{an}的公差为_.
问题描述:
等差数列{an}中,a2=9,a5=33,{an}的公差为______.
答
∵等差数列{an}中,a2=9,a5=33,
∴
,
a1+d=9
a1+4d=33
解得a1=1,d=8.
故答案为:8.