a)
godzina ma 60 minut
godzina – h
1 min = [tex]\frac{1}{60}[/tex] h
5 min = [tex]\frac{5}{60}[/tex] h = [tex]\frac{1}{12}[/tex] h
20 min = [tex]\frac{20}{60}[/tex] h = [tex]\frac{2}{6}[/tex] h = [tex]\frac{1}{3}[/tex] h
30 min = [tex]\frac{30}{60}[/tex] h = [tex]\frac{1}{2}[/tex] h = pół godziny
b)
centymetr ma 10 milimetrów
1 mm = [tex]\frac{1}{10}[/tex] cm = 0,1 cm
5 mm = [tex]\frac{5}{10}[/tex] cm = 0,5 cm = [tex]\frac{1}{2}[/tex] cm = pół centymetra
9 mm = [tex]\frac{9}{10}[/tex] cm = 0,9 cm
19 mm = [tex]\frac{19}{10}[/tex] cm = [tex]\frac{10 + 9}{10}[/tex] cm = [tex]\frac{10}{10} + \frac{9}{10}[/tex] cm = [tex]1\frac{9}{10}[/tex] cm = 1,9 cm
liczę na naj <3
