Răspuns :
V12 = V(4x3) =2V3
V27 = V(9x3)=3V3
V75= V(25x3) = 5V3
E = 2V3-3V3-5V3= -6V3
V27 = V(9x3)=3V3
V75= V(25x3) = 5V3
E = 2V3-3V3-5V3= -6V3
[tex] \it \sqrt{12} - \sqrt{27} - \sqrt{75} = 2\sqrt{3} - 3\sqrt{3} - 5\sqrt{3} = - \sqrt{3} - 5\sqrt{3} = \boxed{ - 6\sqrt{3} }[/tex]