1) ( ( m + 4 ) / ( m² - 6m + 9 ) ) : ( ( m² - 16 ) / ( m - 3 )) =
= ( ( m + 4 ) / ( m - 3 )² ) : ( ( m - 4 )( m + 4 ) / ( m - 3 )) =
= 1 / ( ( m - 3 )( m - 4 ))
2) 1 / ( m - 4 ) - 1 / ( ( m - 3 )( m - 4 )) = ( m - 3 - 1 ) / (( m - 3 )( m - 4 )) =
= ( m - 4 ) / (( m - 3 )( m - 4 )) = 1 / ( m - 3 )
Ответ 1 / ( m - 3 )