已知数列an的各项满足:a1=1-3k,an=4^n-1-3a(n-1)(1)判断数列an-4^n/7是否成等比数列;(2)若数列an为递增数列,求k的取值范围;
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![已知数列an的各项满足:a1=1-3k,an=4^n-1-3a(n-1)(1)判断数列an-4^n/7是否成等比数列;(2)若数列an为递增数列,求k的取值范围;](/uploads/image/z/3755036-20-6.jpg?t=%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97an%E7%9A%84%E5%90%84%E9%A1%B9%E6%BB%A1%E8%B6%B3%EF%BC%9Aa1%3D1-3k%2Can%3D4%5En-1-3a%28n-1%29%281%29%E5%88%A4%E6%96%AD%E6%95%B0%E5%88%97an-4%5En%2F7%E6%98%AF%E5%90%A6%E6%88%90%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%EF%BC%9B%EF%BC%882%EF%BC%89%E8%8B%A5%E6%95%B0%E5%88%97an%E4%B8%BA%E9%80%92%E5%A2%9E%E6%95%B0%E5%88%97%2C%E6%B1%82k%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%EF%BC%9B)
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