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1. \(\sqrt{121} =\) [ ];
2. \(\sqrt{144:36} =\) [ ];
3. \(\sqrt{16} - \sqrt{49} = \) [ ];
4. \(\sqrt{4^3} = \) [ ];
5. \(87^2 - 86^2 = \) [ ];
6. \(\sqrt{196} : \sqrt{(-7)^2} = \) [ ].