Brüche

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Addition

(a / n) + (b / n) = (a + b) / n
(a / b) + (c / d) = (a · d) + (b · c) / (b · d)

Subtraktion

(a / n) - (b / n ) = (a - b) / n
(a / b) - (c / d) = (a · d) - (b · c) / (b · d)

Multiplikation

(a / b) · c = (a · c) / b
(a / b) · (c / d) = (a · c) / (b · d)

Division

(a / b) : c = a / (b · c)
(a / b) : (c / d) = (a / b) · (d / c) = (a · d) / (b · c)



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