1.在数列(an)中,a1=3,an+1=an+2n,求an和Sn 2.a1=3,an=(n+1) /n*an-1 看不懂看图
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![1.在数列(an)中,a1=3,an+1=an+2n,求an和Sn 2.a1=3,an=(n+1) /n*an-1 看不懂看图](/uploads/image/z/8879826-66-6.jpg?t=1.%E5%9C%A8%E6%95%B0%E5%88%97%EF%BC%88an%EF%BC%89%E4%B8%AD%2Ca1%3D3%2Can%2B1%3Dan%2B2n%2C%E6%B1%82an%E5%92%8CSn+2.a1%3D3%2Can%3D%28n%2B1%29+%2Fn%2Aan-1+%E7%9C%8B%E4%B8%8D%E6%87%82%E7%9C%8B%E5%9B%BE)
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