Выполни действия

а) \(\dfrac{x^2-9}{2x+6}:\dfrac{x-3}{x+3}=\) [ ];

б) \(\dfrac{x^2+x}{x-7}:\dfrac{3x+3}{2x-14}=\) [ ];

в) \(\dfrac{x^2+2x}{x^2-x}:\dfrac{2x+4}{x-1}=\) [ ];

г) \(\dfrac{x+12}{x-4}:\dfrac{3x+36}{x^2-4x}=\) [ ];

д) \(\dfrac{5x}{x-1}:\dfrac{5x^2+5x}{2x-2}=\) [ ];

е) \(\dfrac{2x-4}{2x+5}:\dfrac{2x^2-4x}{6x+15}=\) [ ];

ж) \(\dfrac{x^2+2x+1}{x^2-2x+1}:\dfrac{x+1}{x-1}=\) [ ];

з) \(\dfrac{x+5}{x+3}:\dfrac{x^2+10x+25}{x^2+6x+9}=\) [ ].