(m-n)/(m^2/3+m^1/3n^1/3+n^2/3) cрочно!!!

[tex] \frac{m-n}{ m^{ \frac{2}{3} }+ m^{ \frac{1}{3} } n^{ \frac{1}{3} } + n^{ \frac{2}{3} } } = \\ \\ \frac{( m^{ \frac{1}{3} }- n^{ \frac{1}{3} } )( m^{ \frac{2}{3} }+ m^{ \frac{1}{3} } n^{ \frac{1}{3} } + n^{ \frac{2}{3} } ) }{ m^{ \frac{2}{3} }+ m^{ \frac{1}{3} } n^{ \frac{1}{3} } + n^{ \frac{2}{3} } } = m^{ \frac{1}{3} }- n^{ \frac{1}{3} } \\ \\ [/tex]