Question

(-1 + 1/4)⁻² + 2,4 ÷ (-8/5)

Answer 1

$(-1+ \frac{1}{4} )^2+2,4:(- \frac{8}{5} )=( \frac{-3}{4} )^2+ \frac{24}{10} : (-\frac{8}{5})= \frac{9}{16}+ \frac{12}{5}.( -\frac{5}{8} )$

$\frac{9}{16}- \frac{12}{8} = \frac{18-48}{32} = \frac{-36}{32} =- \frac{9}{8}$