Question

Chứng minh rằng: A= 2010/2011+2011/2012+2012/2010 > 3

Answer 1

Lời giải:

$A=1-\frac{1}{2011}+1-\frac{1}{2012}+1+\frac{2}{2010}$

$=3+(\frac{1}{2010}-\frac{1}{2011})+(\frac{1}{2010}-\frac{1}{2012})$

$> 3+0+0+0=3$

Ta có đpcm.