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Diffstat (limited to 'vorlesungen/slides/3/division2.tex')
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diff --git a/vorlesungen/slides/3/division2.tex b/vorlesungen/slides/3/division2.tex new file mode 100644 index 0000000..80d6a75 --- /dev/null +++ b/vorlesungen/slides/3/division2.tex @@ -0,0 +1,32 @@ +% +% division2.tex +% +% (c) 2021 Prof Dr Andreas Müller, OST Ostschweizer Fachhochschule +% +\begin{frame}[t] +\frametitle{Division in $\Bbbk[X]$} +\vspace{-5pt} +\begin{block}{Aufgabe} +Finde Quotienten und Rest der Polynome +$a(X) = X^4-X^3-7X^2+X+6$ +und +$b(X) = 2X^2+X+1$ +\end{block} +\begin{block}{Lösung} +\[ +\arraycolsep=1.4pt +\renewcommand{\arraystretch}{1.2} +\begin{array}{rcrcrcrcrcrcrcrcrcrcr} +X^4&-& X^3&-& 7X^2&+& X&+& 6&:&2X^2&+&X&+&1&=&\frac12X^2&-&\frac34X&-\frac{27}{8} = q\\ +\llap{$-($}X^4&+&\frac12X^3&+& \frac12X^2\rlap{$)$}& & & & & & & & & & & & & & & \\ \cline{1-5} + &-&\frac32X^3&-&\frac{15}2X^2&+& X& & & & & & & & & & & & & \\ + &\llap{$-($}-&\frac32X^3&-&\frac{ 3}4X^2&-&\frac{ 3}4X\rlap{$)$}& & & & & & & & & & & & & \\\cline{2-7} + & & &-&\frac{27}4X^2&+&\frac{ 7}4X&+& 6& & & & & & & & & & & \\ + & & &\llap{$-($}-&\frac{27}4X^2&-&\frac{27}8X&-&\frac{27}{8}\rlap{$)$}& & & & & & & & & & & \\\cline{4-9} + & & & & & &\frac{41}8X&+&\frac{75}{8}\rlap{$\mathstrut=r$}& & & & & & & & & & & \\ +\end{array} +\] +Funktioniert, weil man in $\Bbbk[X]$ immer normieren kann +\end{block} + +\end{frame} |