Question

помогите вычеслите 1) 4/7 + 2/5
2)7/12-5/9
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Answer 1

Ответ:

$\frac{4}{7} + \frac{2}{5} = \frac{20 + 14}{35} = \frac{34}{35 }$

$\frac{7}{12} - \frac{5}{9} = \frac{21 - 20}{36} = \frac{1}{36}$