CMR: Với mọi số tự nhiên n lớn hơn 2 thì \(\frac{\frac{1}{2}+\frac{1}{4}+\frac{1}{6}+...+\frac{1}{2n}}{1+\frac{1}{3}+\frac{1}{5}+...+\frac{1}{2n-1}}< \frac{n}{n+1}\)

CMR \(\forall n\in\)N* ta có

\(\left(1-\frac{1}{2}\right)+\left(\frac{1}{3}-\frac{1}{4}\right)+\left(\frac{1}{5}-\frac{1}{6}\right)+...+\left(\frac{1}{2n-1}-\frac{1}{2n}\right)=\frac{1}{n+1}+\frac{1}{n+2}+...+\frac{1}{2n}\)

CMR: với \(y=\frac{x^n+\frac{1}{x^n}}{x^n-\frac{1}{x^n}}\)thì \(\frac{x^{2n}+\frac{1}{x^{2n}}}{x^{2n}-\frac{1}{x^{2n}}}=\frac{y^2+1}{2y}\)

\(CMR:\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+...+\frac{1}{2^n}=\frac{\left(2n-1\right)}{2^n}\)

CMR: với số nguyên dương \(n\ge2\) ta có \(\frac{2n+1}{3n+2}< \frac{1}{2n+2}+\frac{1}{2n+3}+...+\frac{1}{4n+2}< \frac{3n+2}{4\left(n+1\right)}\)

CMR: \(N=\frac{1}{4^2}+\frac{1}{6^2}+\frac{1}{8^2}+...+\frac{1}{\left(2n\right)^2}< \frac{1}{4}\)(n thuộc N , n lớn hơn bằng 2)

CMR \(\frac{1}{n+1}+\frac{1}{n+2}+...+\frac{1}{2n}>\frac{1}{2}\)

 thì \(\frac{1}{51}+\frac{1}{52}+...+\frac{1}{100}>\frac{1}{2}\)

CMR:

1\(\frac{1}{n+1}+\frac{1}{n+2}+...+\frac{1}{2n}>\frac{1}{2}\left(n\in N;n>1\right)\)

a) CMR: \(\frac{1}{2^2}+\frac{1}{3^2}+\frac{1}{4^2}+...+\frac{1}{n^2}< \frac{3}{4}\)

b) CMR: \(\frac{1}{3^2}+\frac{1}{5^2}+\frac{1}{7^2}+...+\frac{1}{\left(2n+1\right)^2}< \frac{1}{4}\)