$\lim_{x\to-3}\left(\frac{x^2-8x+15}{x+3}\right)$
$\frac{9x^2+3x^3-14}{x^2+x-3}$
$\left(3^2.5\right)^3$
$0,3w-0,7w$
$3\:x+\left[-4y-x+2\right]\left[\:x\:-y\right]-3\:y$
$2a^2\:5a^2\:4a^2$
$\left(x-\frac{1}{2y}\right)^4$
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