как то так.......................
(1/8+2/9-1/4)*5 1/7+(7/9-2/3+1/6)=
7/72*5 1/7+5/18=
1/72 * 5 5/18=
5/72+5/18=25/72
как то так.......................
(1/8+2/9-1/4)*5 1/7+(7/9-2/3+1/6)=
7/72*5 1/7+5/18=
1/72 * 5 5/18=
5/72+5/18=25/72