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11/12 +10/11

 03.12.2020
 #1
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\(\frac{11}{12}+\frac{10}{11} = \frac{11 \cdot 11}{12 \cdot 11}+\frac{10 \cdot 12}{11 \cdot 12} = \frac{121}{132} + \frac{120}{132} = \frac{241}{132}\)

 

The trick is to expand the fractions, so the denominator is the same for each fraction. 

 03.12.2020

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