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  1. Paris la ville de l'amour
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    Let $x,\,y,\,z,\,a,\,b$ be positive real such that $xa+yb\le ya+zb\le za+xb$.

    Prove that $y\le z$.

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    Quote Originally Posted by anemone View Post
    Let $x,\,y,\,z,\,a,\,b$ be positive real such that $xa+yb\le ya+zb\le za+xb$.

    Prove that $y\le z$.

  3. Paris la ville de l'amour
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    #3 Thread Author
    Thanks for participating, Albert!

    Solution of other:


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