$${ 0.75 }^{ 3 } \times (- \frac{ 4 }{ 6 } ) \times { \left( \frac{ 8 }{ 6 } \right) }^{ 3 } \times 4 \frac{ 1 }{ 8 }$$
$-2.75$
$$0.421875\left(-\frac{4}{6}\right)\times \left(\frac{8}{6}\right)^{3}\times \frac{4\times 8+1}{8}$$
$$0.421875\left(-\frac{2}{3}\right)\times \left(\frac{8}{6}\right)^{3}\times \frac{4\times 8+1}{8}$$
$$-\frac{9}{32}\times \left(\frac{8}{6}\right)^{3}\times \frac{4\times 8+1}{8}$$
$$-\frac{9}{32}\times \left(\frac{4}{3}\right)^{3}\times \frac{4\times 8+1}{8}$$
$$-\frac{9}{32}\times \frac{64}{27}\times \frac{4\times 8+1}{8}$$
$$-\frac{2}{3}\times \frac{4\times 8+1}{8}$$
$$-\frac{2}{3}\times \frac{32+1}{8}$$
$$-\frac{2}{3}\times \frac{33}{8}$$
$$-\frac{11}{4}$$
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