Упрости выражения: 1) \left ( \dfrac{a-2}{a+2}-\dfrac{a+2}{a-2} \right) : \dfrac{12a^2}{4-a^2}= ; 2) \dfrac{5a}{a+3}+\dfrac{a-6}{3a+9} \cdot \dfrac{135}{6a-a^2}= ; 3) \dfrac{m-\dfrac {14m-49}{m}}{\dfrac{7}{m}-1}= .

Задание

Выбери верные ответы

Упрости выражения:

\(\left ( \dfrac{a-2}{a+2}-\dfrac{a+2}{a-2} \right) : \dfrac{12a^2}{4-a^2}=\) [ \(\frac {2}{3a}\) | \(\frac{2a}{3}\) | \(a+1\) | \(\frac {1}{a+1}\) ];
\(\dfrac{5a}{a+3}+\dfrac{a-6}{3a+9} \cdot \dfrac{135}{6a-a^2}=\) [ \(\frac {1}{a+3}\) | \(a-3\) | \(\frac {5(a-3)}{a}\) | \(a+3\) ];
\(\dfrac{m-\dfrac {14m-49}{m}}{\dfrac{7}{m}-1}=\) [ \(\frac {1}{7-m}\) | \(m-7\) | \(7-m\) | \(7+m\) ].