Ile to jest 2/5 +0,3 =(0,8-1/2)= i 3 1/2 - 1/3 *0,6 =

[tex] \frac{2}{5} + \frac{3}{10} = \frac{4}{10} + \frac{3}{10} = \frac{7}{10} = 0,7[/tex]
[tex] \frac{8}{10} - \frac{1}{2} = \frac{8}{10} - \frac{5}{10} = \frac{3}{10} = 0,3 [/tex]
[tex]3 \frac{1}{2} - \frac{1}{3} * \frac{6}{10} = \frac{7}{2} - \frac{1}{5} = \frac{35}{10} - \frac{2}{10} = \frac{3}{10} = 0,3[/tex]