[tex]( \frac{81u}{v} + \frac{4v}{u} -36)* \frac{uv}{2v+9u} [/tex]
выполните умножение

[tex]( \frac{81u}{v} + \frac{4v}{u} -36)\cdot\frac{uv}{2v+9u} = \frac{81u^2+4v^2-36uv}{uv} \cdot\frac{uv}{2v+9u} = \\\ = \frac{(9u-2v)^2}{uv} \cdot\frac{uv}{2v+9u} = \frac{(9u-2v)^2uv}{uv(2v+9u)}= \frac{(9u-2v)^2}{2v+9u}[/tex]