Bonjour,
[tex]\frac{2\sqrt{27}}{\sqrt{2}} = \frac{2\sqrt{27 \times 2}}{2} = 3\sqrt{3 \times 2} =3\sqrt{6}\\ \sqrt{15} \times \sqrt{5} = 5\sqrt{3}\\ \sqrt{63} \times 2\sqrt{21} = \sqrt{21}\times \sqrt{3}\times 2\times \sqrt{21} = 42\sqrt{3}\\ \frac{\sqrt{360}}{\sqrt{20}} = \sqrt{\frac{36}{2}} = \sqrt{18} = 3\sqrt{2}\\ \frac{3\sqrt{15}}{\sqrt{3}} =3\sqrt{5} [/tex]
