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f1(x)=2/(1+x),f(x)=f1[fn(x)],an=[fn(0)-1]/[fn(0)+2],则a2010=?
人气:162 ℃ 时间:2020-05-27 04:15:59
解答
f1(x) = 1/(1+x),a1 = 1/4f2(x)= 2(1+x) / (3+x) a2 = -1/8f3(x) = 2(3+x)/(5+3x),a3 = 1/16f4(x)=2(5+3x)/(11+5x),a4 = -1/32an = (-1)^(n+1) / 2^(n+1)a2010= -1/2^2011
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