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  3. Top | #86

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    ÇáÊÚÏíá ÇáÃÎíÑ Êã ÈæÇÓØÉ ßÇãá ãæÓì ÇáäÇÕÑí ; 02-19-2015 ÇáÓÇÚÉ 10:34 PM

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  5. Top | #87

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  6. Top | #88

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  7. Top | #89

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  8. Top | #90

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    ÈãÇ Çä ÇáÚÈÇÑÉ ÕÍíÍÉ ÏæãÇ ÈÇáÇãßÇä æÖÚ
    a=b=c
    Then
    4a^2+36 a^2> or =K*a^3/(3a)

    Then k< or =120
    Then
    Maximum value forK is 120

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  10. Top | #91

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  12. Top | #92

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    åÐÇ ÇáÓÄÇá æÍáå åæ ãä ÇÓÆáÉ IMO

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  14. Top | #93

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    ÇÓÊÇÐäÇ ÇáßÈíÑ ÕáÇÍ ÃÍãÏ íÈÍË Úä ãÇÏÉ ááÍá æÇäÊÙÑÊ ãä ÇáÇ뾃 ãä íÝÊÍ ÔåíÊå æáßäí íÆÓÊ ¡ ÝáÇÍÙ ÇÚÏÇÏ ÒæÇÑ ÇáãäÊÏì ÇäÎÝÖÊ ááÑÈÚ .. . äÇÓ ãáÊåíÉÈÜ ..............................


    DAY 176: ÌÏ Íá ÇáãÚÇÏáÉ ÇáÊÇáíÉ Ýí ãÌãæÚÉ ÇáÇÚÏÇÏ ÇáÍÞíÞíÉ:

    \[\frac{{2x}}{{3{x^2} - x + 2}} - \frac{{7x}}{{3{x^2} + 5x + 2}} = 1\]






    ÇáÊÚÏíá ÇáÃÎíÑ Êã ÈæÇÓØÉ ßÇãá ãæÓì ÇáäÇÕÑí ; 02-15-2018 ÇáÓÇÚÉ 06:04 PM

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  18. Top | #95

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    ÇáÍá ãÖ龯 Ýí ãÌãæÚÉ ÇáÇÚÏÇÏ ÇáãÑßÈÉ áßä...




    \[\begin{gathered}
    Day:\,\,196.\,\,\,\,\,\,\,\,\,\,\,Solve\,\,in\,\,\ mathbb{R}\,\,\,\,\,the\,\,eqaution\,\,\frac{{2x}}
    {{3{x^2} - x + 2}} - \frac{{7x}}
    {{3{x^2} + 5x + 2}} = 1 \hfill \\
    Sol\,\,\,\,\frac{{2x}}
    {{3{x^2} - x + 2}} - \frac{{7x}}
    {{3{x^2} + 5x + 2}} = 1 & & \div \frac{x}
    {x}\,\,\,,x \ne 0 \hfill \\
    \,\,\,\, \Rightarrow \frac{2}
    {{3x - 1 + \frac{2}
    {x}}} - \frac{7}
    {{3x + 5 + \frac{2}
    {x}}} = 1\,\,\,\,\,\,\,\,\,\,\,\,\,\,Let\,\,\,3x + \frac{2}
    {x} = u \hfill \\
    \,\,\,\, \Rightarrow \frac{2}
    {{u - 1}} - \frac{7}
    {{u + 5}} = 1\,\, \hfill \\
    \,\,\,\, \Rightarrow 2u + 10 - 7u + 7 = {u^2} + 4u - 5 \hfill \\
    \,\,\,\, \Rightarrow {u^2} + 9u - 22 = 0\,\,\,\,\,\, \Rightarrow \left( {u + 11} \right)\left( {u - 2} \right) = 0\,\,\,\, \Rightarrow Either\,\,u = - 11\,\,Or\,\,u = 2\, \hfill \\
    1.\,\,\,\,\,If\,\,\,u = - 11\,\,\,\,\, \Rightarrow \,3x + \frac{2}
    {x} = - 11\,\,\,\, \Rightarrow 3{x^2} + 11x + 2 = 0\,\,;\,\,{b^2} - 4ac = 121 - 24 = 97 \hfill \\
    \,\,x = \frac{{ - b \pm \sqrt {{b^2} - 4ac} }}
    {{2a}} = \, = \frac{{ - 11 \pm \sqrt {97} }}
    {6}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\ ,\,\, \hfill \\
    \,2.\,\,If\,\,\,\,u = 2 \Rightarrow 3x + \frac{2}
    {x} = 2\,\,\,\, \Rightarrow 3{x^2} - 2x + 2 = 0\,\,\,\,\,\,\,;\,\,{b^2} - 4ac = 4 - 24 = - 24 < 0 \hfill \\
    No\,\,solution\,\,in\,\,\mathbb{R}\, \hfill \\
    \therefore \,\,\,\,\,\,\,\,\,S.S. = \left\{ {\frac{{ - 11 + \sqrt {97} }}
    {6},\frac{{ - 11 - \sqrt {97} }}
    {6}} \right\} \hfill \\
    \end{gathered} \]











    ÇáÊÚÏíá ÇáÃÎíÑ Êã ÈæÇÓØÉ ßÇãá ãæÓì ÇáäÇÕÑí ; 02-17-2018 ÇáÓÇÚÉ 12:54 PM

  19. Top | #96

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    Day: 177
    ãËá ÈíÇäíÇ ÇáãÌãæÚÉ A æÌÏ ÈØÑÞ ãÎÊáÝÉ ÇáãÓÇÍÉ ÇáÊí ÊÍÏÏåÇ åÐå ÇáãÌãæÚÉ:



    \[A = \left\{ {\left( {x,y} \right):0 \le x \le 2\,\,,\,\,\,\,0 \le y \le {x^2}} \right\}\]























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