在数列{an}中,a1=2,Sn=a1+a2+...an,且对任意大于1的正整数n,点(根号an,根号an-1)在直线C上(1)若直线C的方程为x-y-根号2=0,求an及limSn/na2n(2)若直线C的方程为kx-y=0(k>0),且limSn=4,求k的值
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![在数列{an}中,a1=2,Sn=a1+a2+...an,且对任意大于1的正整数n,点(根号an,根号an-1)在直线C上(1)若直线C的方程为x-y-根号2=0,求an及limSn/na2n(2)若直线C的方程为kx-y=0(k>0),且limSn=4,求k的值](/uploads/image/z/3178335-39-5.jpg?t=%E5%9C%A8%E6%95%B0%E5%88%97%7Ban%7D%E4%B8%AD%2Ca1%3D2%2CSn%3Da1%2Ba2%2B...an%2C%E4%B8%94%E5%AF%B9%E4%BB%BB%E6%84%8F%E5%A4%A7%E4%BA%8E1%E7%9A%84%E6%AD%A3%E6%95%B4%E6%95%B0n%2C%E7%82%B9%28%E6%A0%B9%E5%8F%B7an%2C%E6%A0%B9%E5%8F%B7an-1%29%E5%9C%A8%E7%9B%B4%E7%BA%BFC%E4%B8%8A%EF%BC%881%EF%BC%89%E8%8B%A5%E7%9B%B4%E7%BA%BFC%E7%9A%84%E6%96%B9%E7%A8%8B%E4%B8%BAx-y-%E6%A0%B9%E5%8F%B72%3D0%2C%E6%B1%82an%E5%8F%8AlimSn%2Fna2n%EF%BC%882%EF%BC%89%E8%8B%A5%E7%9B%B4%E7%BA%BFC%E7%9A%84%E6%96%B9%E7%A8%8B%E4%B8%BAkx-y%3D0%EF%BC%88k%3E0%29%2C%E4%B8%94limSn%3D4%2C%E6%B1%82k%E7%9A%84%E5%80%BC)
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