Question

calcule A) (-2/5)-³ b)(-2)-³ c)(-5)-2

Answer 1

$a) (- \frac{2}{5} )^{-3}= \frac{1}{(- \frac{2}{5} )^{3}} = \frac{1}{(- \frac{2}{5} )*(- \frac{2}{5} )*(- \frac{2}{5} )} = - \frac{1}{ (-\frac{8}{125}) } = \frac{1}{-0,064} =-15,625 \\ \\ b) (-2)^{-3} = \frac{1}{(-2)^3} = \frac{1}{(-2)*(-2)*(-2)} = \frac{1}{-8} =-0,125 \\ \\ c)(-5)^{-2}= \frac{1}{(-5)*(-5)} = \frac{1}{25} =0,04$

Espero ter ajudado. Valeu!