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Suche von den fünf gegebenen Bruchzahlen diejenige aus, die nicht denselben Wert hat wie alle anderen.
\nQuelle: Angepasste und übersetzte Version von https://numbas.mathcentre.ac.uk/question/23233/select-the-fraction-not-equivalent-to-the-others-small-denominators/ von Christian Lawson-Perfect.
", "licence": "Creative Commons Attribution 4.0 International"}, "statement": "Eine kleine Übung zum Vergleichen von Bruchzahlen.
", "advice": "Um die gesuchte Zahl zu finden, kürzen wir alle Brüche.
\n\\begin{align}
\\frac{\\var{mone}}{\\var{none}} &= \\frac{\\var{m_coprime}}{\\var{n_coprime}}\\times\\frac{\\var{one}}{\\var{one}} = \\frac{\\var{m_coprime}}{\\var{n_coprime}}\\\\[0.5em]
\\frac{\\var{mtwo}}{\\var{ntwo}} &= \\frac{\\var{m_coprime}}{\\var{n_coprime}}\\times\\frac{\\var{two}}{\\var{two}} = \\frac{\\var{m_coprime}}{\\var{n_coprime}}\\\\[0.5em]
\\frac{\\var{mthree}}{\\var{nthree}} &= \\frac{\\var{m_coprime}}{\\var{n_coprime}}\\times\\frac{\\var{three}}{\\var{three}} = \\frac{\\var{m_coprime}}{\\var{n_coprime}}\\\\[0.5em]
\\frac{\\var{mfour}}{\\var{nfour}} &= \\frac{\\var{m_coprime}}{\\var{n_coprime}}\\times\\frac{\\var{four}}{\\var{four}} = \\frac{\\var{m_coprime}}{\\var{n_coprime}}\\\\[0.5em]
\\frac{\\var{mfive}}{\\var{nfive}} &= \\frac{\\var{mfive/gcd(mfive,nfive)}}{\\var{nfive/gcd(mfive,nfive)}} \\times \\frac{\\var{gcd(mfive,nfive)}}{\\var{gcd(mfive,nfive)}} = \\frac{\\var{mfive/gcd(mfive,nfive)}}{\\var{nfive/gcd(mfive,nfive)}}
\\end{align}
In allen Fällen bis auf einen erhalten wir den Wert $\\displaystyle\\frac{\\var{m_coprime}}{\\var{n_coprime}}$.
\nDer Ausnahmebruch ist $\\displaystyle\\frac{\\var{mfive}}{\\var{nfive}}$.
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