Odpowiedź:
a)
[tex]\frac{2}{7} * 14 = \frac{28}{7} = 4[/tex]
[tex]\frac{2}{7} * 42 = \frac{84}{7} = 12[/tex]
[tex]\frac{2}{7} * 140 = \frac{280}{7} = 40[/tex]
b)
[tex]\frac{3}{5} * 35 = \frac{105}{5} = 21[/tex]
[tex]\frac{3}{5} * 210 = \frac{630}{5} = 126[/tex]
[tex]\frac{3}{5} * 600 = \frac{1800}{5} = 360[/tex]