Question

calculati:
7,(15) + 2,(18)-5(23)+11(20)
-5,2(7)+6,1(3)-3,5(3)+2,2(2)

Answer 1

a)7,(15)=7 intregi si 15/99=708/99
   2,(18)=2 intregi 18/99=216/99
   5,(23)=5 intregi 23/99=518/99
   11,(20)=11 intregi 20/99=1109/99
708/99+216/99-518/99+1109/99=1515/99=505/33=15,(30)

b)-5,2(7)=-5 intregi (27-2)/90=-475/90
    6,1(3)=6 intregi (13-1)/90=552/90
    3,5(3)=3 intregi (53-5)/90=318/90
    2,2(2)=2 intregi (22-2)/90=200/90
-475/90+552/90-318/90+200/90=-41/90

Answer 2

7,(15)+2,(18)-5,(23)+11,(20)=
9,(33)-5,(23)+11,(20)=
4101+11,(20)=15, (3)

-5,2(7)+6,1(3)-3,5(3)+2,2(2)=
0,85-3,5(3)+2,2(2)=
-2,6(7)+2,2(2)= -0,4(5)