已知数列{an}满足a1=2,an+1-an+1=0(n属于N*),则此数列的通项an等于
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![已知数列{an}满足a1=2,an+1-an+1=0(n属于N*),则此数列的通项an等于](/uploads/image/z/942391-55-1.jpg?t=%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97%7Ban%7D%E6%BB%A1%E8%B6%B3a1%3D2%2Can%2B1-an%2B1%3D0%28n%E5%B1%9E%E4%BA%8EN%2A%EF%BC%89%2C%E5%88%99%E6%AD%A4%E6%95%B0%E5%88%97%E7%9A%84%E9%80%9A%E9%A1%B9an%E7%AD%89%E4%BA%8E)
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已知数列{an}满足a1=2,an+1-an+1=0(n属于N*),则此数列的通项an等于
已知数列{an}满足a1=2,an+1-an+1=0(n属于N*),则此数列的通项an等于
已知数列{an}满足a1=2,an+1-an+1=0(n属于N*),则此数列的通项an等于
∵a(n+1)-an+1=0
∴a(n+1)-an=-1
∴an是一个公差为-1的等差数列
∴an=a1+(n-1)d
=2-(n-1)
=3-n
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