Выполни действия 1) \left( 2-\dfrac{2a-b}{a+b}\right)\cdot \left( 1+\dfrac{2a+b}{a-b}\right); 2-\dfrac{2a-b}{a+b}=... 1+\dfrac{2a+b}{a-b}=... ... 2) \dfrac{c+2}{c}:\left( \dfrac{c^2+4}{c^2-2c}+\dfrac{4}{c-2}\right); 3) \dfrac{3x-9}{x-3}-\dfrac{9-x^2}{y}\cdot \dfrac{xy}{(x+3)^2}; 4) \dfrac{5a-1}{3a+1}-\dfrac{a}{3a+1}:\dfrac{a}{9a^2-1}-\dfrac{8a}{3a+1}; 5) \left( \dfrac{2}{(5-n)^2}-\dfrac{1}{n^2-25}\right) \cdot (n-5)^2+\dfrac{2n}{n+5}; 6) \dfrac{a^2-ab-2b+2a}{a^2+ab-2b-2a}:\dfrac{ab-a^2+4a-4b}{2b-ab+2a-a^2}.

Задание

Выполни действия

\(\dfrac{c+2}{c}:\left( \dfrac{c^2+4}{c^2-2c}+\dfrac{4}{c-2}\right) \) ;
\(\dfrac{3x-9}{x-3}-\dfrac{9-x^2}{y}\cdot \dfrac{xy}{(x+3)^2}\) ;
\(\dfrac{5a-1}{3a+1}-\dfrac{a}{3a+1}:\dfrac{a}{9a^2-1}-\dfrac{8a}{3a+1}\) ;
\(\left( \dfrac{2}{(5-n)^2}-\dfrac{1}{n^2-25}\right) \cdot (n-5)^2+\dfrac{2n}{n+5}\) ;
\(\dfrac{a^2-ab-2b+2a}{a^2+ab-2b-2a}:\dfrac{ab-a^2+4a-4b}{2b-ab+2a-a^2}\) .