Va rog ajutati-maaaaaa

A)
4/5 +3/5 - 2/5 =
7/5 - 2/5 =
5/5 =
1
B)
15/10 - 3/10 - 2/10 =
12/10 - 2/10 =
10/10 =
1
C)
3/4 - 1/4 +2/4 =
2/4 +2/4 =
4/4 =
1