求证:an=[√(4n-3)-1]/21/(a1+1)+1/(a1+1)(a2+1)+1/(a1+1)(a2+1)(a3+1)+.+1/(a1+1)(a2+1)(a3+1)...(an+1)<3对于任意n包含于N+,都有an=[√(4n-3)-1]/2求证1/(a1+1)+1/(a1+1)(a2+1)+1/(a1+1)(a2+1)(a3+1)+......+1/(a1+1)(a2+1)(a3+1)...(an
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