Breuken

Vermenigvuldigen

abcd=acbd\Large \frac{\textcolor{blue}{a}}{\textcolor{red}{b}} \cdot \frac{\textcolor{green}{c}}{\textcolor{orange}{d}} = \frac{\textcolor{blue}{a}\cdot \textcolor{green}{c}}{\textcolor{red}{b}\cdot \textcolor{orange}{d}}

Optellen

ab+cd=(ad)+(cb)bd\Large \frac{\textcolor{blue}{a}}{\textcolor{red}{b}}+\frac{\textcolor{green}{c}}{\textcolor{orange}{d}} = \frac{(\textcolor{blue}{a}\cdot \textcolor{orange}{d})+(\textcolor{green}{c}\cdot \textcolor{red}{b})}{\textcolor{red}{b}\cdot \textcolor{orange}{d}} xab+ycd=x+y+ab+cd\Large x\frac{\textcolor{blue}{a}}{\textcolor{red}{b}}+y\frac{\textcolor{green}{c}}{\textcolor{orange}{d}} = x+y+\frac{\textcolor{blue}{a}}{\textcolor{red}{b}}+\frac{\textcolor{green}{c}}{\textcolor{orange}{d}}

Delen

a(bc)=acb\Large \frac{\textcolor{blue}{a}}{(\frac{\textcolor{red}{b}}{\textcolor{green}{c}})} = \textcolor{blue}{a}\cdot\frac{\textcolor{green}{c}}{\textcolor{red}{b}} (ab)c=abc\Large \frac{(\frac{\textcolor{blue}{a}}{\textcolor{red}{b}})}{\textcolor{green}{c}} = \frac{\textcolor{blue}{a}}{\textcolor{red}{b}\cdot \textcolor{green}{c}}