在数列{an}中,1/2 a1 + 1/2^2 a2 + 1/2^3 a3 +...+1/2^n an = 2n+5 ,则an=______
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![在数列{an}中,1/2 a1 + 1/2^2 a2 + 1/2^3 a3 +...+1/2^n an = 2n+5 ,则an=______](/uploads/image/z/400189-13-9.jpg?t=%E5%9C%A8%E6%95%B0%E5%88%97%7Ban%7D%E4%B8%AD%2C1%2F2+a1+%2B+1%2F2%5E2+a2+%2B+1%2F2%5E3+a3+%2B...%2B1%2F2%5En+an+%3D+2n%2B5+%2C%E5%88%99an%3D______)
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