Division/Ed/Reproduzieren/Aufgabe/Lösung

Ed rechnet

{}{\begin{aligned}63&=6\cdot 10+3\\&=6\cdot (7+3)+3\\&=6\cdot 7+6\cdot 3+3\\&=6\cdot 7+21\\&=6\cdot 7+2\cdot 10+1\\&=6\cdot 7+2\cdot (7+3)+1\\&=6\cdot 7+2\cdot 7+2\cdot 3+1\\&=8\cdot 7+7\\&=9\cdot 7,\end{aligned}}

die Antwort ist also

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