在等差数列中,记公差为d,前n项的和为sn,已知a6-a3=1,4s6=11s3,求通项an
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在等差数列中,记公差为d,前n项的和为sn,已知a6-a3=1,4s6=11s3,求通项an
![在等差数列中,记公差为d,前n项的和为sn,已知a6-a3=1,4s6=11s3,求通项an](/uploads/image/z/2485191-39-1.jpg?t=%E5%9C%A8%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%E4%B8%AD%2C%E8%AE%B0%E5%85%AC%E5%B7%AE%E4%B8%BAd%2C%E5%89%8Dn%E9%A1%B9%E7%9A%84%E5%92%8C%E4%B8%BAsn%2C%E5%B7%B2%E7%9F%A5a6-a3%3D1%2C4s6%3D11s3%2C%E6%B1%82%E9%80%9A%E9%A1%B9an)
6(a1+a6)/2=s6
3(a1+a3)/2=s3
because 4s6=11s3
24(a1+a6)=33(a1+a3)
24a1-33a1+24a6-33a3=o
because a6-a3=1
thus -9a1-9a3+24=0
24-18a2=0
solve a2,3a2=s3,s6 can be solved too,and then u will see how to do it
what a boring day~
i wanna back to china!
3(a1+a3)/2=s3
because 4s6=11s3
24(a1+a6)=33(a1+a3)
24a1-33a1+24a6-33a3=o
because a6-a3=1
thus -9a1-9a3+24=0
24-18a2=0
solve a2,3a2=s3,s6 can be solved too,and then u will see how to do it
what a boring day~
i wanna back to china!
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