## Double inequality

For discussing Olympiad Level Algebra (and Inequality) problems

### Double inequality

Prove that $0\le bc+ca+ab-2abc\le{7\over27}$, where $x,y$ and $z$ are non-negative real numbers satisfying $a+b+c=1$
Katy729

Posts: 25
Joined: Sat May 06, 2017 2:30 am

### Re: Double inequality

Someone?
Katy729

Posts: 25
Joined: Sat May 06, 2017 2:30 am