M-9n/n+n/m m/n=1/3 помогите решить

Question

M-9n/n+n/m m/n=1/3 помогите решить

Answer 1

( m - 9n ) / n + ( n / m ) = ( m( m - 9n ) + n^2 ) / mn = ( m^2 - 9mn + n^2 ) / mn
m / n = 1/3
n = m : 1/3
n = 3m
( m^2 - 9m•3m + 9m^2 ) / 3m^2 = ( - 17m^2 ) / 3m^2 = - 17/3 = - 5 2/3
Ответ ( - 5 2/3 )