Define $a$ and $b$ as scalars, $a=0.75$, and $b=11.3$, and $x, y$ and $z$ as the vectors, $x=2,5$, $1,9, y=0.2,1.1,1.8,2$ and $z=-3,2,5,4$. Use these variables to calculate $A$ using element-by-element computations for the vectors with MATLAB.

\[A=\frac{x^{1.1} y^{-2} z^{5}}{(a+b)^{b / 3}}+a \frac{\frac{z}{x}+\frac{y}{2}}{z^{a}}\]