$\lim_{x\to1}\left(1-\frac{1}{x-1}\right)$
$\int\frac{x^3+4}{x^4-5x\:^2}dx$
$3x-3y$
$1,6^2-1,6$
$\frac{d}{dt}e=0,0216-0,0013e$
$\left(x-20\right)\left(x-45\right)$
$1\frac{3}{4}a-b+\frac{7}{3}c+5\frac{1}{2}a+b-c-7\frac{1}{2}b-\frac{7}{6}b$
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