Answer :

[tex](- \frac{5}{10} )( \frac{ x^{3} }{ x^{3}} } )( \frac{ y^{3} }{ y^{3} y^{4} } )( \frac{z^{4} }{ z^{4} } )[/tex] => [tex](- \frac{1}{2} )( \frac{1}{ y^{4} } ) => \frac{-1}{2 y^{4} } .[/tex]

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