Răspuns:
[tex]b = 10 \times ( \frac{ \sqrt{50} }{50} + \frac{ \sqrt{5} }{10} - \frac{ \sqrt{20} }{20} )[/tex]
[tex]b = 10 \times ( \frac{5 \sqrt{2} }{50} + \frac{ \sqrt{5} }{10} - \frac{2 \sqrt{5} }{20} )[/tex]
[tex]b = 10 \times ( \frac{ \sqrt{2} }{10} + \frac{ \sqrt{5} }{10} - \frac{ \sqrt{5} }{10} )[/tex]
[tex]b = \sqrt{2} [/tex]
