$\lim_{x\to\infty}\left(\sqrt{x-4}-\sqrt{x-5}\right)$
$24,53\:\cdot7,4$
$5x-2<7x+1$
$10x-x+4y-9x$
$m+n=\sqrt{7}\:y\:mn=1,\:m^4+n^4$
$2\left(-1+1\right)$
$\left(4x^2-7y^2\right)^2$
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