$\lim_{x\to0}\left(\frac{\frac{1}{\sqrt{a+x+7}}-\frac{1}{\sqrt{a+7}}}{x}\right)$
$1.117a-0,35b-2.25a+4,141a$
$\int\frac{2}{9+4x^2}dx$
$6\::\:2\:-\:5\::\:1$
$-7-\left(4-12-8\right)+\left(-2+5\right)+6$
$\sqrt[0]{64}$
$60\cdot7.5$
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