已知等差数列an,若a1 a5 a9=3,a2 a6 a10=6,则a8=?已知等差数列{an},若a1+a5+a9=3,a2+a6+a10=6,则a8=?

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已知等差数列an,若a1a5a9=3,a2a6a10=6,则a8=?已知等差数列{an},若a1+a5+a9=3,a2+a6+a10=6,则a8=?已知等差数列an,若a1a5a9=3,a2a6a10

已知等差数列an,若a1 a5 a9=3,a2 a6 a10=6,则a8=?已知等差数列{an},若a1+a5+a9=3,a2+a6+a10=6,则a8=?
已知等差数列an,若a1 a5 a9=3,a2 a6 a10=6,则a8=?
已知等差数列{an},若a1+a5+a9=3,a2+a6+a10=6,则a8=?

已知等差数列an,若a1 a5 a9=3,a2 a6 a10=6,则a8=?已知等差数列{an},若a1+a5+a9=3,a2+a6+a10=6,则a8=?
a1+a5+a9=3
3a5=3
a5=1
a2+a6+a10=6
3a6=6
a6=2
d=a6-a5=2-1=1
a8=a6+2d=2+1x2=4
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