a) [tex]\sqrt{121} + \sqrt{144} + \sqrt{64} = 11 + 12 + 8 = 31[/tex]
b)[tex]\sqrt{0,04} + \sqrt{0,09} + \sqrt{0,49} = 0,2 + 0,3 + 0,7 = 1,2[/tex]
c)[tex]\sqrt{7\frac{1}{9} } - \sqrt{1\frac{28}{36} } = \sqrt{\frac{64}{9} } - \sqrt{\frac{64}{36} } = \frac{8}{3} - \frac{8}{6} = \frac{16}{6} - \frac{8}{6} = \frac{8}{6} = 1\frac{2}{6} = 1\frac{1}{3}[/tex]
