Odpowiedź:
[tex]3 \frac{9}{12} + 2 \frac{2}{12} = 5 \frac{11}{12} [/tex]
[tex]3 \frac{9}{12} - 2 \frac{2}{12} = 1 \frac{7}{12}[/tex]
[tex] \frac{15}{4} \times \frac{13}{6} = \frac{65}{8} = 8 \frac{1}{8} [/tex]
[tex]\frac{15}{4} \div \frac{13}{6} = \frac{15}{4} \times \frac{6}{13} = \frac{45}{26} = 1 \frac{19}{26} [/tex]
