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" LEAGUE OF LEGENDS "

27/06/2018 at 09:32
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Calculate \(p=\dfrac{3x-2y}{3x+2y}\) know x , y satisfy x < 2y and  \(9x^2+4y^2=20xy\)




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    Dao Trong Luan Coordinator 28/06/2018 at 01:07

    \(9x^2+4y^2=20xy\)

    \(\Leftrightarrow\left(3x\right)^2-12xy+\left(2y\right)^2=8xy\)

    \(\Leftrightarrow\left(3x-2y\right)^2=8xy\)

    \(9x^2+4y^2=20xy\)

    \(\Leftrightarrow\left(3x\right)^2+12xy+\left(2y\right)^2=32xy\)

    \(\Leftrightarrow\left(3x+2y\right)^2=32xy\)

    \(\Rightarrow p=\sqrt{\dfrac{\left(3x-2y\right)^2}{\left(3x+2y\right)^2}}=\sqrt{\dfrac{8xy}{32xy}}=\sqrt{\dfrac{1}{4}}=\dfrac{1}{2}\)

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