已知数列an的前n项和f(n)是n的二次函数,f(n)满足f(2+n)=f(2-n),且f(4)=0,f(1)=-3.(1)求数列的通项公式已知数列an的前n项和f(n)是n的二次函数,f(n)满足f(2+n)=f(2-n),且f(4)=0,f(1)=-3.(1)求数列的通项公式 (2)设数
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![已知数列an的前n项和f(n)是n的二次函数,f(n)满足f(2+n)=f(2-n),且f(4)=0,f(1)=-3.(1)求数列的通项公式已知数列an的前n项和f(n)是n的二次函数,f(n)满足f(2+n)=f(2-n),且f(4)=0,f(1)=-3.(1)求数列的通项公式 (2)设数](/uploads/image/z/11668100-68-0.jpg?t=%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97an%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8Cf%28n%29%E6%98%AFn%E7%9A%84%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0%2Cf%28n%29%E6%BB%A1%E8%B6%B3f%282%2Bn%29%3Df%282-n%29%2C%E4%B8%94f%284%29%3D0%2Cf%281%29%3D-3.%281%29%E6%B1%82%E6%95%B0%E5%88%97%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97an%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8Cf%28n%29%E6%98%AFn%E7%9A%84%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0%2Cf%28n%29%E6%BB%A1%E8%B6%B3f%282%2Bn%29%3Df%282-n%29%2C%E4%B8%94f%284%29%3D0%2Cf%281%29%3D-3.%281%29%E6%B1%82%E6%95%B0%E5%88%97%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F+%282%29%E8%AE%BE%E6%95%B0)
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