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а) \(\dfrac{a}{b} \cdot \dfrac{c}{d} = \) [ ];

б) \(\dfrac{3}{x} \cdot \dfrac{y}{5} = \) [ ];

в) \(\dfrac{5}{x} \cdot \dfrac{x}{x-1} = \) [ ];

г) \(\dfrac{6}{x+1} \cdot \dfrac{x+1}{12x} = \) [ ];

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

е) \(\dfrac{3x-1}{x-7} \cdot \dfrac{2x-14}{9x-3} = \) [ ];

ж) \(\dfrac{2x-12}{12x-3} \cdot \dfrac{1-4x}{6-x} = \) [ ];

з) \(\dfrac{x+5}{4x-4} \cdot \dfrac{1-x}{3x+15} = \) [ ].