Упрости выражения и заполни пропуски

1. \(4\sqrt{a}+3\sqrt{a}-5\sqrt{a} = \) [ ] \(\sqrt{a}\) ;
2. \(\sqrt{9x}+\sqrt{25x}-\sqrt{36x} = \) [ ] \(\sqrt{x}\) ;
3. \(2\sqrt{4y}+5\sqrt{16y}-\sqrt{121y} = \) [ ] \(\sqrt{y}\) ;
4. \(5\sqrt{c}+3\sqrt{d}-\sqrt{c}+3\sqrt{d} = \) [ ] \(\sqrt{c} + \) [ ] \(\sqrt{d}\) ;
5. \(-\sqrt{x}+3\sqrt{4y}+\sqrt{9x}-\sqrt{y} = \) [ ] \(\sqrt{x} + \) [ ] \(\sqrt{y}\) .