11页.1.三个数成等差数列,其比为3∶4∶5,如果最小数加上1,则三个数成等比数列,那么原三数是什么?2.求和:1+2x+3x²+...+n*x的(n-1)次方3.已知数列{an}的通项公式an=-2n+11,如果bn=丨an丨(n∈N
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![11页.1.三个数成等差数列,其比为3∶4∶5,如果最小数加上1,则三个数成等比数列,那么原三数是什么?2.求和:1+2x+3x²+...+n*x的(n-1)次方3.已知数列{an}的通项公式an=-2n+11,如果bn=丨an丨(n∈N](/uploads/image/z/1725701-5-1.jpg?t=11%E9%A1%B5.1.%E4%B8%89%E4%B8%AA%E6%95%B0%E6%88%90%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E5%85%B6%E6%AF%94%E4%B8%BA3%E2%88%B64%E2%88%B65%2C%E5%A6%82%E6%9E%9C%E6%9C%80%E5%B0%8F%E6%95%B0%E5%8A%A0%E4%B8%8A1%2C%E5%88%99%E4%B8%89%E4%B8%AA%E6%95%B0%E6%88%90%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%2C%E9%82%A3%E4%B9%88%E5%8E%9F%E4%B8%89%E6%95%B0%E6%98%AF%E4%BB%80%E4%B9%88%3F2.%E6%B1%82%E5%92%8C%EF%BC%9A1%2B2x%2B3x%26%23178%3B%2B...%2Bn%2Ax%E7%9A%84%EF%BC%88n-1%EF%BC%89%E6%AC%A1%E6%96%B93.%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97%EF%BD%9Ban%EF%BD%9D%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8Fan%3D-2n%2B11%2C%E5%A6%82%E6%9E%9Cbn%3D%E4%B8%A8an%E4%B8%A8%EF%BC%88n%E2%88%88N)
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