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Math Help - Solving simultaneous equation and inequation subject to constraints.

  1. #1
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    Solving simultaneous equation and inequation subject to constraints.

    Let a, b, c be positive real number satisfying:
    \frac{1}{a+b+1}+\frac{1}{b+c+1} +\frac{1}{c+a+1}\geq1
    Prove that a+b+c=ab+bc+ca

    Find all real numbers k and m and satisfying:
    k(x^3+y^3+z^3)+mxyz\geq(x+y+z)^3
    with all x,y,znon-negative.

    Solve this equations:
    \sqrt[2]{y^2-8x+9}-\sqrt[3]{xy-6x+12}\leq1and \sqrt{2(x-y)^2+10x-6y+12}-\sqrt{y}=\sqrt{x+2}

    Thank you very much!
    Last edited by mr fantastic; April 10th 2010 at 12:52 AM. Reason: Changed post title
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  2. #2
    Member mathemagister's Avatar
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    Quote Originally Posted by smallchicken1205 View Post
    Let a, b, c be positive real number satisfying:
    \frac{1}{a+b+1}+\frac{1}{b+c+1} +\frac{1}{c+a+1}\geq1
    Prove that a+b+c=ab+bc+ca

    Find all real numbers k and m and satisfying:
    k(x^3+y^3+z^3)+mxyz\geq(x+y+z)^3
    with all x,y,znon-negative.

    Solve this equations:
    \sqrt[2]{y^2-8x+9}-\sqrt[3]{xy-6x+12}\leq1and \sqrt{2(x-y)^2+10x-6y+12}-\sqrt{y}=\sqrt{x+2}

    Thank you very much!
    This looks a lot like homework. Please show us what you have done so far to show that you have at least attempted something. Then ask here about the parts you are stuck on. That way, you are following MHF Policy.
    Also, don't ask more than 2 questions in the same thread, which potentially makes the thread difficult to follow.

    Thanks
    Mathemagister

    PS Sorry if I sound too admin-like.
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  3. #3
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    About asking more than 2 questions in the same thread, sorry, I'll extract experience.
    I think in 1st problem, maybe it must be a+b+c\geq ab+bc+ca
    In 2nd and 3rd problems, I have no orientation, I hope I can receive assistance from you, thank you
    (I study English not well, if it isn't true, I hope you can understand me)
    Last edited by smallchicken1205; April 10th 2010 at 09:52 PM.
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