设n∈N+,求证:1/1²+1/2²+……+1/n²≤2-1/n
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设n∈N+,求证:1/1²+1/2²+……+1/n²≤2-1/n
请给出详细步骤,拜托了!
请给出详细步骤,拜托了!
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(1)n=1时,不等式显然成立
(2)当n≥2时,
∵ 1/n²
(2)当n≥2时,
∵ 1/n²
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