数列{an}中,a1=1,a2=-3,a(n+1)=an+a(n+2).则a2005=?a(n+1)=2an+1/(2^n),a1=2,求an
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![数列{an}中,a1=1,a2=-3,a(n+1)=an+a(n+2).则a2005=?a(n+1)=2an+1/(2^n),a1=2,求an](/uploads/image/z/1159894-46-4.jpg?t=%E6%95%B0%E5%88%97%EF%BD%9Ban%EF%BD%9D%E4%B8%AD%2Ca1%3D1%2Ca2%3D-3%2Ca%28n%2B1%29%3Dan%2Ba%28n%2B2%29.%E5%88%99a2005%3D%3Fa%28n%2B1%29%3D2an%2B1%2F%282%5En%29%2Ca1%3D2%2C%E6%B1%82an)
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