Question

1. (2-¹ ÷ 5-¹)² × (-5/8)-¹​

Answer 1

$( \frac{1}{2} \div \frac{1}{5} ) {}^{2} \times( \frac{8}{ - 5} ) \\ (\frac{1}{4 } \div \frac{1}{25}) \times ( \frac{ - 8}{5} ) \\ \frac{1}{4} \times \frac{25}{1} \times \frac{ - 8}{5} \\ \frac{25}{4 } \times \frac{ - 8}{5}$

cancellation

5×-2

= -10