1·已知在正整数数列{An}中,前n项和Sn满足:Sn=(1/8)(An+2)²,(1)求证:{An}为等差数列(2)若Bn=[(1/2)An]-30,求数列{Bn}的前n项和的最小值2·三个互不相等的数组成等差数列,如果适当排列
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![1·已知在正整数数列{An}中,前n项和Sn满足:Sn=(1/8)(An+2)²,(1)求证:{An}为等差数列(2)若Bn=[(1/2)An]-30,求数列{Bn}的前n项和的最小值2·三个互不相等的数组成等差数列,如果适当排列](/uploads/image/z/15250664-56-4.jpg?t=1%C2%B7%E5%B7%B2%E7%9F%A5%E5%9C%A8%E6%AD%A3%E6%95%B4%E6%95%B0%E6%95%B0%E5%88%97%EF%BD%9BAn%EF%BD%9D%E4%B8%AD%2C%E5%89%8Dn%E9%A1%B9%E5%92%8CSn%E6%BB%A1%E8%B6%B3%EF%BC%9ASn%3D%EF%BC%881%2F8%29%28An%2B2%29%26%23178%3B%2C%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9A%EF%BD%9BAn%EF%BD%9D%E4%B8%BA%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%282%29%E8%8B%A5Bn%3D%5B%281%2F2%29An%5D-30%2C%E6%B1%82%E6%95%B0%E5%88%97%EF%BD%9BBn%EF%BD%9D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC2%C2%B7%E4%B8%89%E4%B8%AA%E4%BA%92%E4%B8%8D%E7%9B%B8%E7%AD%89%E7%9A%84%E6%95%B0%E7%BB%84%E6%88%90%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E5%A6%82%E6%9E%9C%E9%80%82%E5%BD%93%E6%8E%92%E5%88%97)
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