Lösung 1.2:1b
Aus Online Mathematik Brückenkurs 1
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Version vom 13:25, 22. Okt. 2008
Subtraction works in the same way as addition. First, we multiply the top and bottom of each fraction by the other fraction's denominator so that they have a common denominator,
| \displaystyle \frac{2\cdot 5}{7\cdot 5}-\frac{1\cdot 7}{5\cdot 7}=\frac{10}{35}-\frac{7}{35}\,. |
Then the numerators can be subtracted,
| \displaystyle \frac{10}{35}-\frac{7}{35}=\frac{10-7}{35}=\frac{3}{35}\,. |
