Odpowiedź:
a)
[tex] \frac{1}{5} + \frac{3}{5} = \frac{4}{5} [/tex]
b)
[tex] \frac{2}{3} + \frac{3}{5} = \frac{10}{15} + \frac{9}{15} = \frac{19}{15} = 1 \frac{4}{15} [/tex]
c)
[tex] \frac{3}{7} + \frac{2}{9} = \frac{27}{63} + \frac{14}{63} = \frac{41}{63} [/tex]
d)
[tex] \frac{3}{4} - \frac{1}{4} = \frac{2}{4} = \frac{1}{2} [/tex]
e)
[tex] \frac{3}{8} - \frac{2}{3} = \frac{9}{24} - \frac{16}{24} = - \frac{7}{24} [/tex]
f)
[tex] \frac{1}{5} - \frac{3}{13} = \frac{13}{65} - \frac{15}{65} = - \frac{2}{65} [/tex]
g)
[tex] \frac{5}{6} + \frac{5}{8} = \frac{40}{48} + \frac{30}{48} = \frac{70}{48} = \frac{35}{24} = 1 \frac{11}{24} [/tex]
h)
[tex] \frac{3}{10} - \frac{17}{35} = \frac{105}{350} - \frac{170}{350} = - \frac{65}{350} = - \frac{13}{70} [/tex]
