Răspuns :
[tex] m_{g} = \sqrt{( \sqrt{11} + 2)( \sqrt{11} - 2) } = \sqrt{ { \sqrt{11} }^{2} - {2}^{2} } = \sqrt{11 - 4} = \sqrt{7} [/tex]
[tex] m_{g} = \sqrt{( \sqrt{11} + 2)( \sqrt{11} - 2) } = \sqrt{ { \sqrt{11} }^{2} - {2}^{2} } = \sqrt{11 - 4} = \sqrt{7} [/tex]