Выполни действия

1. \(\dfrac{7m}{5m-30}+\dfrac{2m}{18-3m}=\) [ \(\frac {11}{15(m-6)}\) | \(\frac {m}{m+6}\) | \(\frac{1}{m-6}\) | \(\frac {1}{m}\) ].
2. \(\dfrac{4a}{4a+b}-\dfrac{16a^2}{16a^2+8ab+b^2}=\) [ \(\frac {4ab}{(4a+b)^2}\) | \(\frac {a}{(4a+b)^2}\) | \(\frac{b}{4a+b}\) | \(\frac {1}{4a+b}\) ].
3. \(\dfrac{8}{b^2-25}-\dfrac{4}{b^2+5b}=\) [ \(-\frac {2}{b+5}\) | \(\frac 1b\) | \(\frac {4}{b(b-5)}\) | \(\frac {1}{b-5}\) ].