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Сократи дробь:

а) \(\dfrac{3x^2}{9x}=\) [ ];

б) \(\dfrac{2y^3}{8y^2}=\) [ ];

в) \(\dfrac{(x-1)(x+2)}{2x+4}=\) [ ];

г) \(\dfrac{(x-3)(x-4)}{3x-9}=\) [ ];

д) \(\dfrac{x^2-1}{2x-2}=\) [ ];

е) \(\dfrac{x^2-1}{3x+3}=\) [ ];

ж) \(\dfrac{x^2-2x+1}{x^2-1}=\) [ ];

з) \(\dfrac{x^2-4x+4}{x^2-4}=\) [ ];

и) \(\dfrac{x^2+6x+9}{x^2-9}=\) [ ].