1) [m]\lim\limits_{n \rightarrow \infty} \frac{(6-n)^2 - (6+n)^2}{(6+n)^2 - (1-n)^2} = \lim\limits_{n \rightarrow \infty} \frac{36-12n+n^2 - 36-12n-n^2}{36+12n+n^2 - 1+2n-n^2} = [/m]
[m] = \lim\limits_{n \rightarrow \infty} \frac{-24n}{35+14n} = \frac{-24}{14} = -\frac{12}{7}[/m]
2) Это не знаю