等差数列{an}中,a2=5,a4=a6+6,则a1=
问题描述:
等差数列{an}中,a2=5,a4=a6+6,则a1=
答
2d=a6-a4=-6
d=-3
a1=a2-d=8
等差数列{an}中,a2=5,a4=a6+6,则a1=
2d=a6-a4=-6
d=-3
a1=a2-d=8