[tex]{( - \frac{2ab}{c}) }^{4} \div {( \frac{6ab}{75c}) }^{4} = {5}^{k} [/tex]
[tex]{( - \frac{2ab}{c}) }^{4} \div {( \frac{6ab}{75c}) }^{4} = {( - \frac{2ab}{c} \div \frac{6ab}{75c}) }^{4} = {( \frac{ - 2ab}{c} \times \frac{75c}{6ab} ) }^{4} = {( \frac{ - 75}{ 3}) }^{4} = {( - 25)}^{4} = {25}^{4} = {({5}^{2} )}^{2} = {5}^{4} [/tex]
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