Помогите решить задания

${( - 5)}^{3} - {( - 8)}^{2} = - 125 - 64 = - 189$

_____________________

${( - 1 \frac{1}{3}) }^{2} - ({ \frac{5}{6} })^{2} = \frac{1}{9} - \frac{25}{36} = - \frac{7}{12}$

____________________

$( - 1.2 \times ( - 0.4)) - (1.6 \times 0.6) = 0.48 - 0.96 = -\frac{12}{25} = - 0.48$

____________________

$(2.8 + ( - 3.4)) \times ( - 1.6 + 4.2) = - 0.6 \times 2.6 = - \frac{39}{25} = - 1 \frac{14}{25} = - 1.56$

Помогите решить задания​