548
а)
(6-3~5/12)-(3-1~1/12)=(5~12/12-3~5/12)-(2~12/12-1~1/12)=2~7/12-1~11/12=1~19/12-1~11/12=8/12
Б)
(5-2~7/19)-(4-3~2/19)=(4~19/19-2~7/19)-(3~19/19-3~2/19)=2~12/19-17/19=1~31/19-17/19=1~14/19
547
В)(2-1~5/9)+(4-1~4/9)=(1~9/9-1~5/9)+(3~9/9-1~4/9)=4/9+2~5/9=3~9/9=4
Г)(2-1~5/18)+(6-2~11/18)=13/18+3~7/18=4~20/18=5~2/18