$\lim_{x\to0}\left(\frac{-4x}{\sqrt{2-x}-\sqrt{2}}\right)$
$\left(-9x-1-5xy\right)\left(-9x-1+5xy\right)$
$72,51-59,486$
$\lim_{x\to\infty}\left(\frac{6x^4+3}{\left(x^2-7\right)\left(3x^2-1\right)}\right)$
$y^3+3y^2-2y^3$
$10x=240$
$\left(a^{5}+a^{3}\right)a$
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