Question

1 supra 3 ( 1 - 2 supra 5) + 4 supra 5

Answer 1

$\frac{1}{3} \times (1 - \frac{2}{5} ) + \frac{4}{5} = \\ \frac{1}{3} \times ( ^{5)} 1 - \frac{2}{5} ) + \frac{4}{5} = \\ \frac{1}{3} \times ( \frac{5}{5} - \frac{2}{5} ) + \frac{4}{5} = \\ \frac{1}{3} \times \frac{3}{5} + \frac{4}{5} = \\ \frac{1}{5} + \frac{4}{5} = \frac{5}{5} = 1$

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