1.
[tex] \frac{4}{5} + \frac{3}{15} = \frac{12}{15} + \frac{3}{15} = \frac{15}{15} = 1[/tex]
[tex]1 \frac{2}{3} - \frac{1}{6} = 1 \frac{4}{6} - \frac{1}{6} = 1 \frac{3}{6} = 1 \frac{ 1 }{2} [/tex]
[tex] \frac{5}{6} + \frac{11}{18} = \frac{15}{18} + \frac{11}{18} = \frac{26}{18} = 1 \frac{8}{18} = 1 \frac{4}{9} [/tex]
[tex]1 \frac{7}{9} - \frac{2}{3} = 1 \frac{7}{9} - \frac{6}{9} = 1 \frac{1}{9} [/tex]
[tex]1 \frac{5}{9} + \frac{1}{3} = 1 \frac{5}{9} + \frac{3}{9} = 1 \frac{8}{9} [/tex]
[tex]1 \frac{2}{3} - \frac{7}{15} = 1 \frac{10}{15} - \frac{7}{15} = 1 \frac{3}{15} = 1 \frac{1}{5} [/tex]
2.
[tex] \frac{1}{3} = \frac{5}{15} [/tex]
[tex] \frac{2}{5} = \frac{6}{15} [/tex]
[tex] \frac{1}{3} + \frac{2}{5} = \frac{5}{15} + \frac{6}{15} = \frac{11}{15} [/tex]
3.
[tex] \frac{1}{2} = \frac{7}{14} [/tex]
[tex] \frac{3}{7} = \frac{6}{14} [/tex]
[tex] \frac{1}{2} - \frac{3}{7} = \frac{7}{14} - \frac{6}{14} = \frac{1}{14} [/tex]
Myślę że pomogłem ;)
