Răspuns:
12x9=108............
[tex] \sqrt{144} = \sqrt{ {2}^{4} \times {3}^{2} } = {2}^{2} \times 3 = 12[/tex]
[tex] \sqrt{81} = \sqrt{ {3}^{4} } = {3}^{2} = 9[/tex]
[tex]12 \times 9 = 108[/tex]
