$(-5)\cdot {(-\frac{1}{2})}^2+4\frac{1}{2}:(-3)+\mathrm{2,8}\backslash left(-5\backslash right)\backslash cdot\; \backslash left(-\backslash frac\{1\}\{2\}\backslash right)^2+4\backslash frac\{1\}\{2\}:\backslash left(-3\backslash right)+2\{,\}8$

$\Rightarrow \underset{\mathrm{i}\mathrm{s}\mathrm{t}\mathrm{n}\mathrm{e}\mathrm{g}\mathrm{a}\mathrm{t}\mathrm{i}\mathrm{v}}{\underbrace{(-5)\cdot {(-\frac{1}{2})}^2}}+\underset{\mathrm{i}\mathrm{s}\mathrm{t}\mathrm{n}\mathrm{e}\mathrm{g}\mathrm{a}\mathrm{t}\mathrm{i}\mathrm{v}}{\underbrace{4\frac{1}{2}}}\backslash ;\backslash ;\backslash Rightarrow\backslash ;\backslash ;\backslash underbrace\{\backslash left(-5\backslash right)\backslash cdot\backslash left(-\backslash frac12\backslash right)^2\}\_\{\backslash mathrm\{ist\}\backslash ;\backslash mathrm\{negativ\}\}+\backslash underbrace\{4\backslash frac12\backslash underset\{\backslash mathrm\{ist\}\backslash ;\backslash mathrm\{negativ\}\}\{:\backslash underbrace\{\backslash left\backslash \{\backslash left(-3\backslash right)+2\{,\}8\backslash right\backslash \}\}\}\}\_\{\backslash mathrm\{ist\}\backslash ;\backslash mathrm\{negativ\}\}$

$\mathrm{n}\mathrm{e}\mathrm{g}\mathrm{a}\mathrm{t}\mathrm{i}\mathrm{v}+\mathrm{n}\mathrm{e}\mathrm{g}\mathrm{a}\mathrm{t}\mathrm{i}\mathrm{v}=\mathrm{n}\mathrm{e}\mathrm{g}\mathrm{a}\mathrm{t}\mathrm{i}\mathrm{v}\backslash mathrm\{negativ\}\backslash ;+\backslash ;\backslash mathrm\{negativ\}=\backslash ;\backslash mathrm\{negativ\}$