[obm-l] desigualdades....

[DEOLIVEIRASOU@xxxxxxx]

1) prove que 1/(2sqtr n)<1/2*3/4*5/6*....*(2n-3)/(2n-2)*(2n-1)/2n<1/sqtr2n.
2)Prove que 1/2<1/(n+1) + 1/(n+2) + 1/(n+3)+...+1/2n< 3/4 
3)1/(n+1)*( 1+ 1/3+...+1/(2n-1))>1/n*(1/2+1/4+...+1/2n).
              Valeu!!!