Odpowiedź :
a)6 3/7*1 1/20
=45/7*21/20=9/1*3/4=27/4=7
b)8 5/12-3 11/15=8 75/180-3 132/180=
7 225/180-3 132/180=4 123/180
Liczę na naj :))
8.
a)
[tex]6\frac{3}{7}\cdot1\frac{1}{20} = \frac{45}{7}\cdot\frac{21}{20} = 9\cdot\frac{3}{4} = \frac{27}{4} = 6\frac{3}{4} = 6,75[/tex]
b)
[tex]8\frac{5}{12}-3\frac{11}{15} = 8\frac{25}{60} - 3\frac{44}{60} =7\frac{85}{60}-3\frac{44}{60} = 4\frac{41}{60}[/tex]