$\left(\frac{7}{3}\right)^{-3}=\left(\frac{3}{7}\right)^{3}=\frac{27}{343}$
$-\left(-\frac{1}{2}\right)^{-3}=-\left(-2\right)^{3}=-(-8)=8$
$-\left(-\frac{2}{9}\right)^{-4}=-\left(\frac{9}{2}\right)^{4}=-\frac{6561}{16}=-410,0625$
$-\left(-\frac{32}{10}\right)^{-2}=-\left(\frac{10}{32}\right)^{2}=-\frac{100}{1024}$
$-\left(-\frac{1}{2}\right)^{-3}=-\left(-2\right)^{3}=-(-8)=8$
$-\left(-\frac{2}{9}\right)^{-4}=-\left(\frac{9}{2}\right)^{4}=-\frac{6561}{16}=-410,0625$
$-\left(-\frac{32}{10}\right)^{-2}=-\left(\frac{10}{32}\right)^{2}=-\frac{100}{1024}$
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