1. ## for intelligent students!

This is university entrance exam in Vietnam.
A sector: economy, finance, bank, technology, science... university.
B sector: pharmacy, medicine university.
D sector: economy, foreign languages, society university.

2. Originally Posted by dmc0929
This is university entrance exam in Vietnam.
A sector: economy, finance, bank, technology, science... university.
B sector: pharmacy, medicine university.
D sector: economy, foreign languages, society university.

Is there a point to posting this?

3. May i ask a question ?

If the function of variables $x,y,z$ is convertable , ie $f(x,y,z) = f(x,z,y) = f(y,x,z) = f(y,z,x) =f(z,x,y) = f(z,y,x)$ , is there a theorem which states that $f(x,y,z)$ is min. or max when $x = y= z$ ???

4. Originally Posted by simplependulum
May i ask a question ?

If the function of variables $x,y,z$ is convertable , ie $f(x,y,z) = f(x,z,y) = f(y,x,z) = f(y,z,x) =f(z,x,y) = f(z,y,x)$ , is there a theorem which states that $f(x,y,z)$ is min. or max when $x = y= z$ ???
Jensen's inequality?