[tex]A=\sqrt{3}-2\sqrt{2}+\sqrt{3}+2\sqrt{2}[/tex]
( [tex]-2\sqrt{2}[/tex] si [tex]+2\sqrt{2}[/tex] se reduc)
[tex]A=\sqrt{3}+\sqrt{3}[/tex]
[tex]\boxed{A=2\sqrt{3}}[/tex]
[tex]B=\sqrt{12}-6\sqrt{3}+\sqrt{12}-6\sqrt{3}[/tex]
[tex]B=2\sqrt{12}-12\sqrt{3}[/tex]
[tex]B=2\sqrt{2^{2}*3}-12\sqrt{3}[/tex]
[tex]B=2*2\sqrt{3}-12\sqrt{3}[/tex]
[tex]B=4\sqrt{3}-12\sqrt{3}[/tex]
[tex] \boxed{B=-8\sqrt{3}}[/tex]