(5 5/9 - 6,8) : ( 2 13/30 - 2 1/12) • 3,6 =
1) 5 5/9 - 6,8 = 50/9 - 68/100 =
= 50/9 - 17/25 =1250/225 - 153/225=
= 1097/225
2) 2 13/30 - 2 1/12 = 73/30 - 25/12 =
= 146/60 - 125/60 = 21/60 = 7/20
3) 1097/225 : 7/20=(1097•20)/(225•7)
=
= (1097•4)/(45•7) = 4388/315
4) 4388/315 • 3,6=4388 /315 • 36/100=
= 4388/315 • 9/25=
= (1097•4•9)/(315•25) =
=(4388 • 4)/(35•25)= 4388/875 = 5 13/875
=