[Everyday Mathematics]20150102
2015-01-03 17:26
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设 \[ a_1=3,\quad a_{n+1}=\dfrac{1}{2}(a_n^2+1)\quad(n=1,2,\cdots). \] 试求 \[ \vsm{n}\dfrac{1}{1+a_n}. \]
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