Rationale tal: Forskelle mellem versioner
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Linje 2:
<math>\mathbb{Q} = \{\frac{m}{n} \mid m \in \mathbb{Z}, n \in \mathbb{N}\}</math>.
Alle andre reelle tal kaldes for de [[irrationale tal]].
== Aritmetik ==
:<math>\frac{a}{b} + \frac{c}{d} = \frac{ad+bc}{bd}</math>
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