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а) \(\dfrac{2x+6}{x^2-1} \cdot \dfrac{x^2-x}{x+3}=\) [ ];

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

в) \(\dfrac{3x+6}{2x^2-2x} \cdot \dfrac{x-1}{x+2}=\) [ ];

г) \(\dfrac{x+12}{x-4} \cdot \dfrac{5x-20}{x^2+12x}=\) [ ];

д) \(\dfrac{5x}{x-1} \cdot \dfrac{6x-6}{5x^2+5x}=\) [ ];

е) \(\dfrac{3x-3}{2x+4} \cdot \dfrac{2x^2+4x}{7x-7}=\) [ ];

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

з) \(\dfrac{x+6}{x+1} \cdot \dfrac{5x+5}{x^2+12x+36}=\) [ ].