Răspuns:
[tex] \sqrt{ 1.1(3) } = \sqrt{ \frac{113 - 11}{90} } = \sqrt{ \frac{102}{90} } = \sqrt{ \frac{34}{30} } = \sqrt { \frac{17}{15} } = \frac{ \sqrt{17} }{ \sqrt{15} } = \frac{ \sqrt{17} \times \sqrt{15} }{15} = \frac{ \sqrt{255} }{15} [/tex]
[tex] \sqrt{12.25} = \sqrt{ \frac{1225}{100} } = \frac{ \sqrt{1225} }{ \sqrt{100} } = \frac{35}{10} = \frac{7}{2} [/tex]
[tex] \sqrt{0.49} = \sqrt{ \frac{49}{100} } = \frac{ \sqrt{49} }{ \sqrt{100} } = \frac{7}{10} [/tex]
[tex] \sqrt{2.1(6)} = \sqrt{ \frac{216 - 21}{90} } = \sqrt{ \frac{195}{90} } = \sqrt{ \frac{39}{18} } = \sqrt{ \frac{13}{6} } = \frac{ \sqrt{13} }{ \sqrt{6} } = \frac{ \sqrt{13} \times \sqrt{6} }{6} = \frac{ \sqrt{78} }{6} [/tex]
