Results 1 to 2 of 2

Math Help - Inequality very hard

  1. #1
    Newbie
    Joined
    Jan 2013
    From
    China
    Posts
    23

    Inequality very hard

    Let $a,b,c,d\in \mathbb{R}$ and $\left\{\begin{matrix}
    0<a\leq b\leq c\leq d\\
    \frac{1}{a}+\frac{2}{b}+\frac{d}{c}\geq 3\\
    \frac{2}{b}+\frac{d}{c}\geq 2
    \end{matrix}\right.$. Prove that:
    $$a^4+b^4+c^4-d^4\leq 17$$
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Senior Member
    Joined
    Feb 2013
    From
    Saudi Arabia
    Posts
    440
    Thanks
    86

    Re: Inequality very hard

    there is something wrong with your post .it looks like chinese to me
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Very hard inequality
    Posted in the Calculus Forum
    Replies: 5
    Last Post: February 10th 2010, 11:12 AM
  2. Hard/beautiful inequality --help!!
    Posted in the Algebra Forum
    Replies: 4
    Last Post: July 30th 2008, 11:37 PM
  3. Hard inequality,Please help me
    Posted in the Algebra Forum
    Replies: 12
    Last Post: April 14th 2008, 06:19 PM
  4. Replies: 21
    Last Post: November 11th 2007, 07:20 AM
  5. ~~~inequality-- hard
    Posted in the Algebra Forum
    Replies: 1
    Last Post: August 7th 2006, 11:56 PM

Search Tags


/mathhelpforum @mathhelpforum