$$(\frac{4}{-5})^{-8}\times(\frac{4}{-5})^{-3}$$
$-\frac{48828125}{4194304}\approx -11.641532183$
$$\left(\frac{4}{-5}\right)^{-11}$$
$$\left(-\frac{4}{5}\right)^{-11}$$
$$-\frac{48828125}{4194304}$$
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$-\frac{48828125}{4194304} = -11\frac{2690781}{4194304} = -11.641532182693481$
