在数列{an}中,a1=2,a2=5,an+2-3an+1+2an=0,则an=?n+2 ,n+1是下脚标要解题的过程
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![在数列{an}中,a1=2,a2=5,an+2-3an+1+2an=0,则an=?n+2 ,n+1是下脚标要解题的过程](/uploads/image/z/1090493-53-3.jpg?t=%E5%9C%A8%E6%95%B0%E5%88%97%7Ban%7D%E4%B8%AD%2Ca1%3D2%2Ca2%3D5%2Can%2B2-3an%2B1%2B2an%3D0%2C%E5%88%99an%3D%3Fn%2B2+%2Cn%2B1%E6%98%AF%E4%B8%8B%E8%84%9A%E6%A0%87%E8%A6%81%E8%A7%A3%E9%A2%98%E7%9A%84%E8%BF%87%E7%A8%8B)
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