Prove that (1 + 1/x)(1 + 1/y) ≥ 9.
Try calculus:
Show that the LS's minimum occurs
when the (x,y)=(1/2, 1/2) .
Edited on January 1, 2015, 1:03 am
blackjack
<a href="http://c.casalemedia.com/c?s=51816&f=3&id=0" target="_blank"><img src="http://as.casalemedia.com/s?s=51816&u=http://perplexus.info&f=3&id=0&if=0" width="120" height="600" border="0"></a>
flooble's webmaster puzzle
hint- the proof is easy- partial spoiler
