Упрости выражение.

\(\dfrac{\dfrac{1}{m+n}-\dfrac{1}{n}+\dfrac{1}{m}}{\dfrac{1}{n}+\dfrac{1}{m}+\dfrac{1}{m+n}}\)

Выбери верный вариант.

• \(\dfrac{n^2-mn-m^2}{n^2+3mn+m^2}\)
• \(\dfrac{n^2+mn-m^2}{n^2+3mn+m^2}\)
• \(\dfrac{n^2-mn+m^2}{n^2+3mn+m^2}\)
• \(\dfrac{n^2+mn-m^2}{n^2-3mn+m^2}\)