Дробь - 5/12*2 целых 2/3-7 целых 2/3*(-1/6)= (-1 3/4*4 2/3+1 7/9)*(-3/4)=

-5/12*2 2/3-7 2/3*(-1/6)=1/6
1)-5/12*2 2/3=-5/12*8/3=-5/3*2/3=-10/9=-1 1/9
2)7 2/3*(-1/6)=-23/3*1/6=-23/18=-1 5/18
3)-1 1/9-(-1 5/18)=-1 2/18+1 5/18=1 5/18-1 2/18=3/18=1/6

(-1 3/4*4 2/3+1 7/9)*(-3/4)=4 19/24
1)-1 3/4*4 2/3=-7/4*14/3=-7/2*7/3=-49/6=-8 1/6
2)-8 1/6+1 7/9=1 14/18-8 3/18=-7+(14/18-3/18)=-7+11/18=11/18-6 18/18=
=-6 7/18
3)-6 7/18*(-3/4)=115/18*3/4=115/6*1/4=115/24=4 19/24