Math, asked by mohini1820, 1 year ago

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Answered by Nischalunstoppable

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$\frac{2}{5} + ( - \frac{4}{7} + \frac{1}{4} ) \\ \\ = \frac{2}{5} + ( \frac{ - 4 \times 4}{7 \times 4} + \frac{1 \times 7}{4 \times 7} ) \\ \\ = \frac{2}{5} + ( \frac{ - 16}{28} + \frac{7}{28} ) \\ \\ = \frac{2}{5} + ( \frac{( - 16) + 7}{28} ) \\ \\ = \frac{2}{5} + \frac{ - 9}{28} \\ \\ = \frac{2 \times 28}{5 \times 28} + \frac{( - 9) \times 5}{28 \times 5} \\ \\ = \frac{56}{140} + \frac{ - 45}{140} \\ \\ = \frac{56 + ( - 45)}{140} \\ \\ = \frac{11}{140}$

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