Question

[Akio Kioto Juka]

1 ,CMR với n \(\in N\),n\(\ge2\).Ta có :

\(\dfrac{1}{2^3}+\dfrac{1}{3^3}+\dfrac{1}{4^3}+........+\dfrac{1}{n^3}< \dfrac{1}{4}\)

2 , \(\dfrac{1}{2}+\dfrac{2}{2^2}+\dfrac{3}{2^2}+.......+\dfrac{100}{2^{100}}< 2\)

3, CM : \(\dfrac{1}{n+1}+\dfrac{1}{n+2}+\dfrac{1}{n+3}+....+\dfrac{1}{3n+1}< 2\)

Answer 1

[Akio Kioto Juka]

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