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[tex] \frac{2}{3} \div ( - \frac{9}{4} ) = \\ [/tex]
[tex] \frac{2}{3} \times( - \frac{4}{9}) = \\ [/tex]
[tex] - \frac{2 \times 4}{3 \times 9} = - \frac{8}{27} = - ({ \frac{2}{3} })^{3} \\ [/tex]
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