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Rechnen in `QQ`
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`(-1/2)*(1/3)`
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`(1/7)*(-1/3)`
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`(-1/2)*(-1/7)`
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`(-1/7)*(-1/13)`
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`(-1/2)+(1/3)`
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`(-1/2)-(+1/3)`
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`(1/2)-(1/3)`
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`(1/2)+(1/3)`
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`3/2*2.5-2.0`
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`2.5*2/5-1/5`
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`2.5*(2/5-1/5)`
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`(2.5*2/5)-1/5`
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`49/64:7/8`
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`49/64:7`
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`64/49:64/49`
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`6.4/4.9:64/49`
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`1/9`
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`1/3`
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`1/6`
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`1/8`
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`0.bar 1 + 0.bar 2`
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`-0.bar 9 - 0.bar 9`
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`-0.bar 3 *3`
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`0.1bar 6 *(-3)`
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