1.
[Pista de audio]
(3/10)+(8/10)=
2.
[Pista de audio]
(5/8)-(3/5)=
3.
[Pista de audio]
(1/2)+(1/2)=
4.
[Pista de audio]
(3/7)+(4/6)=
5.
[Pista de audio]
(2/3)-(1/2)=
6.
[Pista de audio]
(7/2)+(5/2)=
7.
[Pista de audio]
(9/5)-(3/5)=
8.
[Pista de audio]
(2/9)+(1/4)=
9.
[Pista de audio]
(13/12)-(8/12)=
10.
[Pista de audio]
(2/5)+(1/6)=
