Răspuns:
[tex] \sqrt{54} = \sqrt{ {3}^{2} \times 6} = 3\sqrt{6} \\ \sqrt{60} = \sqrt{ {2}^{2} \times 3 \times 5 } = 2 \sqrt{15} \\ \sqrt{63} = \sqrt{ {3}^{2} \times 7 } = 3 \sqrt{7} \\ \sqrt{72} = \sqrt{ {2}^{2} \times {3}^{2} \times 2 } = 6 \sqrt{2} [/tex]
