Question

M²⁻n²/mn + n-m/m - m/n / -- дробь) помогите плиз

Answer 1

$\frac{m^2-n^2}{mn} + \frac{n-m}{m}-\frac{m}{n}= \frac{m^2-n^2+n(n-m)-m*m}{mn}= \frac{m^2-n^2+n^2-mn-m^2}{mn}= \\ \\ = \frac{-mn}{mn}=-1$