17.
[tex] \sqrt{54} = \sqrt{6 \times 9} = 3 \sqrt{6} [/tex]
18. tu nie wiem czy można to bardziej skrócić
[tex] \sqrt[3]{96} = \sqrt[3]{8 \times 12} = 2 \sqrt[3]{12} [/tex]
19.
[tex]7 \sqrt{2} + \sqrt{50} - \sqrt{32} = 7 \sqrt{2} + \sqrt{2 \times 25} - \sqrt{2 \times 16} = 7 \sqrt{2} + 5 \sqrt{2} - 4 \sqrt{2} = 8 \sqrt{2} [/tex]
