Question

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Answer 1

$\frac{2}{3} \times ( \frac{ - 1}{2} ) + \frac{1}{15} + \frac{2}{3} \times \frac{4}{5} \\ \\ = - \frac{1}{3} + \frac{1}{15} + \frac{8}{15} \\ \\ = - \frac{1}{3} + \frac{9}{15} \\ \\ = - \frac{ 1}{3} + \frac{3}{5} \\ \\ = \frac{ - 5 + 9}{15} \\ \\ = \frac{4}{15}$