$\left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right]\left( \right)\left\{ \right\}\lfloor x \rfloor\lim_{n \to \infty} a_n\sqrt{x}\left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right]$
$\frac{x}{y}\left[ \right]\lim_{x \to 0}\lim_{n \to \infty} a_n\frac{x}{y}\neq$
$\int\limits^a_b {x} \, dx\left( \right)\lfloor x \rfloor\prod_{a}^{b}$
$\lfloor x \rfloor\frac{x}{y}\lceil x \rceilx_{123}$
$x^{123}\left( \right)\lim_{x \to 0}\left \{ {{y=2} \atop {x=2}} \right.\sqrt[n]{x}\lceil x \rceil\geq\frac{x}{y}$
Dla jakiej wartości parametru a proste k: -x+(2a-1)y-10=0 i l: (a+7)x+2y+8=0 , są prostopadłe?