Odpowiedź:
[tex] \frac{3}{7} \times 28 = \frac{3}{1} \times 4 = 12[/tex]
[tex] \frac{1}{3} \times 3 \frac{3}{4} = \frac{1}{3} \times \frac{15}{4} = \frac{5}{4} = 1 \frac{1}{4} [/tex]
[tex]1 \frac{1}{7} \times 2 \frac{1}{4} = \frac{8}{7} \times \frac{9}{4} = \frac{18}{7} = 2 \frac{4}{7} [/tex]
