数列an中,a1=-18,a(n+1)=a(n)+3求an前n项和和Sn最小值
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![数列an中,a1=-18,a(n+1)=a(n)+3求an前n项和和Sn最小值](/uploads/image/z/10343843-35-3.jpg?t=%E6%95%B0%E5%88%97an%E4%B8%AD%2Ca1%3D-18%2Ca%28n%2B1%29%3Da%28n%29%2B3%E6%B1%82an%E5%89%8Dn%E9%A1%B9%E5%92%8C%E5%92%8CSn%E6%9C%80%E5%B0%8F%E5%80%BC)
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数列an中,a1=-18,a(n+1)=a(n)+3求an前n项和和Sn最小值
数列an中,a1=-18,a(n+1)=a(n)+3求an前n项和和Sn最小值
数列an中,a1=-18,a(n+1)=a(n)+3求an前n项和和Sn最小值
这是个公差是3首项是-18的等差数列