Numere rationale

Notiuni de baza

Tipuri de fractii:

Fractii Echivalente:

$$$\frac { a }{ b } \quad =\quad \frac { c }{ d } \quad$$$, daca $$$\quad a\quad \cdot \quad d\quad =\quad b\quad \cdot \quad c$$$, unde $$$a,b,c,d\quad \in \quad \mathbb{N},\quad b\quad \neq \quad 0,\quad d\quad \neq \quad 0$$$

Numere Rationale Nenegative:

$$${ \varrho  }_{ + }\quad =\quad \left\{ \frac { a }{ b } |\quad a\quad \in \quad \mathbb{N} ,\quad b\quad \in \quad { \mathbb{N}  }^{ * } \right\} $$$. Observam ca multimea numerelor naturale $$$\mathbb{N} \quad \subset { \quad Q }_{ + }$$$