Răspuns:
b)
[tex] - 21 \sqrt{2} - 7 \sqrt{3} + 6 \sqrt{2} + 6 \sqrt{3} = - 15 \sqrt{2} - \sqrt{3} [/tex]
d)
[tex] \sqrt{15} + \sqrt{6} + 6 \sqrt{15} - 4 \sqrt{6} = 7 \sqrt{15} - 3 \sqrt{6} [/tex]
