Răspuns:
[tex]a) \sqrt{18} + \sqrt{72} - 5 \sqrt{2} = 3 \sqrt{2} + 6 \sqrt{2} - 5 \sqrt{2} = 4 \sqrt{2} [/tex]
[tex]b) \sqrt{0.9} + \frac{ \sqrt{169} }{36} - \sqrt{30.25} = \\ \frac{3}{ \sqrt{10} } + \frac{13}{36} - \frac{55}{10} = \frac{3 \sqrt{10} }{10 } + \frac{1}{2} \frac{5}{5} - \\ \frac{55}{10} = \frac{3 \sqrt{10} - 50}{10} [/tex]
