Double inequality

For discussing Olympiad Level Algebra (and Inequality) problems
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Double inequality

Post Number:#1  Unread postby Katy729 » Fri Aug 04, 2017 1:21 pm

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

Post Number:#2  Unread postby Katy729 » Sat Aug 19, 2017 11:10 pm

Someone? :(
Katy729
 
Posts: 25
Joined: Sat May 06, 2017 2:30 am


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