a)
[tex]1 \frac{4}{11} + \frac{9}{11} = 1 \frac{13}{11} = 2 \frac{2}{11} [/tex]
b)
[tex]1 \frac{3}{8} + 2 \frac{1}{3} = 1 \frac{9}{24} + 2 \frac{8}{24} = 3 \frac{17}{24} [/tex]
c)
[tex] \frac{3}{7} \ \div \frac{9}{28} = \frac{3}{7} \times \frac{28}{9} = \frac{1}{1} \times \frac{4}{3} = \frac{4}{3} = 1 \frac{1}{3} [/tex]
d)
[tex] \frac{2}{9} \div 2 \frac{2}{3} = \frac{2}{9} \div \frac{8}{3} = \frac{2}{9} \times \frac{3}{8} = \frac{1}{3} \times \frac{1}{4} = \frac{1}{12} [/tex]
Myślę że pomogłem ;)
