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Find the minimum of $x-y$ among all ordered pairs of real numbers $(x, y)$, $x$ and $y$ between 0 and 1, where there exists a real number $a \neq 1$ such that\[ \log_{x}a + \log_{y}a = 4\log_{xy}a. \]

 Mar 27, 2018
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Did you find how to this this? I also need help on this question....

 Apr 2, 2018

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