how can i do?
For a,b,c real positive numbers, show that ;
(a+b+c)(1/a + 1/b + 1/c)>= 9
is there any theorem to use?
i dont know theorems based on this..
can u help me with this?
You could start with
are positive numbers).
So, multiply out the LHS of your inequality and collect up terms. The two terms involving can be combined to produce the fraction , so you can make use of the result obtained earlier.
Do the same for the terms involving and those involving , and the result follows.