Odpowiedź:
1.
[tex] \frac{5}{ \sqrt{5} } \times \frac{ \sqrt{5} }{ \sqrt{5} } = \frac{5 \sqrt{5} }{5} = \sqrt{5} [/tex]
2.
[tex] \frac{6}{ \sqrt[3]{2} } \times \frac{ \sqrt[3]{ {2}^{2} } }{ \sqrt[3]{ {2}^{2} } } = \frac{6 \sqrt[3]{4} }{2} = 3 \sqrt[3]{4} [/tex]
3.
[tex] \frac{ \sqrt{50} - \sqrt{72} }{ \sqrt{2} } = \frac{5 \sqrt{2} - 6 \sqrt{2} }{ \sqrt{2} } = \frac{ - \sqrt{2} }{ \sqrt{2} } = - 1[/tex]
4.
[tex]4 \sqrt{5} = \sqrt{16 \times 5} = \sqrt{80} [/tex]
[tex]9 = \sqrt{81} [/tex]
[tex] \sqrt{81} > \sqrt{80} \\ 9 > 4 \sqrt{5} [/tex]
5.
[tex]3 \sqrt{2x} = 12 \\ \sqrt{2x} = 4 \\ 2x = 16 \\ x = 8[/tex]
