$\int\frac{3x^2+2x+3}{x\left(x^2+9\right)}dx$
$3abc-3\:si\:a=2,\:b=3\:i\:c=0$
$5r\:-\:6x\:+\:3x\:+\:45\:-\:25\:+\:2r$
$8\cdot9-2\cdot3^3+5\cdot2^3$
$\left(x^{-2}\right)^{-3}$
$-k+3k$
$\left(t-2\right)\left(t-2\right)\left(t-2\right)$
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