Răspuns:
(7/8+9/8)×5-2^2=
(7/8+9/8)×5-2^2= 16/8 ×5-2^2=
(7/8+9/8)×5-2^2= 16/8 ×5-2^2=2 ×5-4=6
.
3×(1/3+1/4+1/12)-1=
3×(4/12+3/12+1/12)-1=
3×(16/12+1/12)-1=
3×17/12-1=
17/4-1=
16/4=4
.
5-(1/2+1/15+1/30)×5=
5-(15/30+2/30+1/30)×5=
5-(13/30+1/30)×5=
5-14/30×5=
5-14/6