Задание
Восстанови запись
\(\dfrac{a}{a-b}~=~\dfrac{...}{a^2-ab}\) ;
\(...=\) [ ].
\(\dfrac{x-y}{a}~=~\dfrac{...}{ax+ay}\) ;
\(...=\) [ ].
\(\dfrac{c+d}{c-d}~=~\dfrac{...}{c^{2}-2cd+d^{2}}\) ;
\(...=\) [ ].
\(\dfrac{c+a}{a-c}~=~\dfrac{...}{a^{2}-c^{2}}\) ;
\(...=\) [ ].