若数列{αn}前n项的和Sn=n²+2n+5,则α₁+α₂+α₃=
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![若数列{αn}前n项的和Sn=n²+2n+5,则α₁+α₂+α₃=](/uploads/image/z/3818436-60-6.jpg?t=%E8%8B%A5%E6%95%B0%E5%88%97%7B%CE%B1n%7D%E5%89%8Dn%E9%A1%B9%E7%9A%84%E5%92%8CSn%3Dn%26%23178%3B%2B2n%2B5%2C%E5%88%99%CE%B1%26%238321%3B%2B%CE%B1%26%238322%3B%2B%CE%B1%26%238323%3B%3D)
若数列{αn}前n项的和Sn=n²+2n+5,则α₁+α₂+α₃=
若数列{αn}前n项的和Sn=n²+2n+5,则α₁+α₂+α₃=
若数列{αn}前n项的和Sn=n²+2n+5,则α₁+α₂+α₃=
若数列{αn}前n项的和Sn=n²+2n+5,
则α₁+α₂+α₃=S3=3²+2×3+5=9+6+5=20;
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