Odpowiedź:
a)
[tex] \frac{5}{9} + \frac{2}{9} = \frac{7}{9} [/tex]
b)
[tex] \frac{4}{7} + \frac{5}{7} = \frac{9}{7} = 1 \frac{2}{7} [/tex]
c)
[tex] 2 \frac{2}{7} + \frac{3}{7} = 2 \frac{5}{7} [/tex]
d)
[tex]2 \frac{3}{5} + 3 \frac{4}{5} = 5 \frac{7}{5} = 6 \frac{2}{5} [/tex]
e)
[tex] \frac{12}{13} - \frac{8}{13} = \frac{4}{13} [/tex]
f)
[tex]4 \frac{13}{21} - 2 \frac{6}{21} = 2 \frac{7}{21} = 2 \frac{1}{3} [/tex]
g)
[tex]7 - \frac{5}{8} = 6 \frac{3}{8} [/tex]
h)
[tex]3 \frac{1}{8} - 1 \frac{5}{8} = 1 \frac{4}{8} = 1 \frac{1}{2} [/tex]
