已知an=3n²-3n+1,求证:1/f(1)+1/f(2)+1/f(3)+...+1/f(n)<4/3
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已知an=3n²-3n+1,求证:1/f(1)+1/f(2)+1/f(3)+...+1/f(n)<4/3
已知an=3n²-3n+1,求证:1/f(1)+1/f(2)+1/f(3)+...+1/f(n)<4/3
已知an=3n²-3n+1,求证:1/f(1)+1/f(2)+1/f(3)+...+1/f(n)<4/3
当n>1时候1/f(n)