Lösung 1.2:1c
Aus Online Mathematik Brückenkurs 1
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Version vom 13:25, 22. Okt. 2008
We multiply the top and bottom of each fraction by the other fraction's denominator so that they have a common denominator,
| \displaystyle \frac{1}{6}-\frac{2}{5}=\frac{1\cdot 5}{6\cdot 5}-\frac{2\cdot 6}{5\cdot 6}=\frac{5}{30}-\frac{12}{30}\,. |
Then the numerators can be subtracted
| \displaystyle \frac{5}{30}-\frac{12}{30}=\frac{5-12}{30}=\frac{-7}{30}=-\frac{7}{30}\,. |
