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Приведи дроби к общему знаменателю:

1. \(\dfrac{3}{4c^3d}\) , \(\dfrac{11}{15cd^2}\) и \(\dfrac{7}{10d}\) ; [ ], [ ] и [ ];

2. \(\dfrac{x}{6x+2y}\) , \(\dfrac{x}{4y+12x}\) и \(\dfrac{x}{y}\) ; [ ], [ ] и [ ];

3. \(\dfrac{5}{x^2-9y^2}\) , \(\dfrac{2}{2x+6y}\) и \(\dfrac{7}{12y-4x}\) ; [ ], [ ] и [ ];

4. \(\dfrac{1}{x^2}\) , \(\dfrac{3}{x^2+10x+25}\) и \(\dfrac{5}{x^2-10x+25}\) ; [ ], [ ] и [ ].