Сложение и вычитание дробей

a) $$\frac{4}{9} + \frac{2}{9} = \frac{4+2}{9} = \frac{6}{9} = \frac{2}{3}$$

б) $$\frac{1}{11} + \frac{8}{11} = \frac{1+8}{11} = \frac{9}{11}$$

в) $$\frac{12}{19} + \frac{7}{19} = \frac{12+7}{19} = \frac{19}{19} = 1$$

г) $$\frac{18}{1000} + \frac{26}{1000} = \frac{18+26}{1000} = \frac{44}{1000} = \frac{11}{250}$$

д) $$\frac{5}{6} - \frac{2}{6} = \frac{5-2}{6} = \frac{3}{6} = \frac{1}{2}$$

е) $$\frac{4}{8} - \frac{2}{8} = \frac{4-2}{8} = \frac{2}{8} = \frac{1}{4}$$

ж) $$\frac{11}{16} - \frac{4}{16} = \frac{11-4}{16} = \frac{7}{16}$$

з) $$\frac{47}{100} - \frac{26}{100} = \frac{47-26}{100} = \frac{21}{100}$$