Question

với mọi số tự nhiên n>=2 hãy so sánh

a)A=1/2^2+1/3^2+1/4^2+...+1/n^2 với 1

Answer 1

\(\text{a)}A=\frac{1}{2^2}+\frac{1}{3^2}+\frac{1}{4^2}+...+\frac{1}{n^2}

Answer 2

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