Bài 1 : `CMR : `
`1 < \frac{2012}{2011^2 + 1} + \frac{2012}{2011^2+2} + \frac{2012}{2011^2+3} + ... +\frac{2012}{2011^2+2011} < 2`
Bài 2 : `CMR`
$\frac{1}{\sqrt[]{1}} + \frac{1}{\sqrt[]{2}} + \frac{1}{\sqrt[]{3}} + ... + \frac{1}{\sqrt[]{100}} > 10$
Loga
Sinh Học lớp 12
