Question

me ajudem e se puderem me dar a contar também ​

Answer 1

$\frac{1}{2} + \frac{1}{4} \times ( - \frac{7}{2} ) - \frac{5}{4} \times ( - \frac{1}{8} ) \\ \frac{1}{2} - \frac{7}{8} + \frac{5}{32} \\ \frac{16 - 28 + 5}{32} \\ \frac{ - 7}{32}$