Solution 1.2:1b
From Förberedande kurs i matematik 1
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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, | 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, | ||
+ | {{Displayed math||<math>\frac{2\cdot 5}{7\cdot 5}-\frac{1\cdot 7}{5\cdot 7}=\frac{10}{35}-\frac{7}{35}\,</math>.}} | ||
- | + | Then the numerators can be subtracted, | |
- | + | {{Displayed math||<math>\frac{10}{35}-\frac{7}{35}=\frac{10-7}{35}=\frac{3}{35}\,</math>.}} | |
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- | <math>\frac{10}{35}-\frac{7}{35}=\frac{10-7}{35}=\frac{3}{35}</math> | + |
Current revision
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}\,. |