$-25-36x^4$
$\frac{x^3+3x^2-5x+7}{x^2}$
$3x=3x$
$\frac{x^3+2x+3}{x^2+1}$
$\frac{0,2+1.1}{0.6}-1$
$\int\frac{5x^{3}-9x^{2}+8x-16}{x^{4}-6x^{2}+8x-3}dx$
$\lim_{t\to x}\frac{5}{x-7}$
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