已知数列{an}的前n项和为Sn,对一切正整数n,点Pn(n,Sn)都在函数f(x)=x的平方+2x的图象上,且过点Pn(n,Sn)的切线的斜率为Kn(1)求{an}数列的通项公式 (2)若bn=2的Kn次方an,(2^Kn)an,求数列{bn}的前n项和Tn(3)设Q=
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![已知数列{an}的前n项和为Sn,对一切正整数n,点Pn(n,Sn)都在函数f(x)=x的平方+2x的图象上,且过点Pn(n,Sn)的切线的斜率为Kn(1)求{an}数列的通项公式 (2)若bn=2的Kn次方an,(2^Kn)an,求数列{bn}的前n项和Tn(3)设Q=](/uploads/image/z/2681989-61-9.jpg?t=%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97%7Ban%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BASn%2C%E5%AF%B9%E4%B8%80%E5%88%87%E6%AD%A3%E6%95%B4%E6%95%B0n%2C%E7%82%B9Pn%28n%2CSn%29%E9%83%BD%E5%9C%A8%E5%87%BD%E6%95%B0f%28x%29%3Dx%E7%9A%84%E5%B9%B3%E6%96%B9%2B2x%E7%9A%84%E5%9B%BE%E8%B1%A1%E4%B8%8A%2C%E4%B8%94%E8%BF%87%E7%82%B9Pn%28n%2CSn%29%E7%9A%84%E5%88%87%E7%BA%BF%E7%9A%84%E6%96%9C%E7%8E%87%E4%B8%BAKn%281%29%E6%B1%82%7Ban%7D%E6%95%B0%E5%88%97%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F+%282%29%E8%8B%A5bn%3D2%E7%9A%84Kn%E6%AC%A1%E6%96%B9an%2C%282%5EKn%29an%2C%E6%B1%82%E6%95%B0%E5%88%97%7Bbn%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8CTn%283%29%E8%AE%BEQ%3D)
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