Выбери верные ответы

1. \(\dfrac{4b}{3b-21}+\dfrac{3b}{14-2b}=\) [ \(-\frac {b}{6(b-7)}\) | \(\frac {1}{b-7}\) | \(\frac{b+1}{b-7}\) | \(\frac {b-7}{b+1}\) ].
2. \(\dfrac{3p}{3p+2q}-\dfrac{9p^2}{9p^2+12pq+4q^2}=\) [ \(\frac {6pq}{9p^2+12pq+4q^2}\) | \(\frac {pq}{(3p+2q)^2}\) | \(\frac{1}{(3p+2q)^2}\) | \(\frac {p}{9p^2+12pq+4q^2}\) ].
3. \(\dfrac{4}{c^2-36}-\dfrac{2}{c^2-6c}=\) [ \(-\frac {2}{c}\) | \(\frac {c}{c-6}\) | \(\frac {2}{c(c+6)}\) | \(\frac {1}{c+6}\) ].