Effectuer les opérations ci-dessous et écrit la réponse sous la forme d'une fraction irréductible.
2/3+5/3=
11/3-7/3=
1/2+1/4=
5/4-1/8=
3/10+2/5=
7/20-1/4=
1-3/5=
2+1/3=

5/2-1=
3-7/10=
2/9+2=
5/2+3/3=
2/5-1/7=
2/9+3/8=
3/2-2/5=
10/3+5/4=

 2/3 + 5/3 = 8/3
11/3 - 7/3 = 4/3
1/2 +1/4 + 3/4
5/4 - 1/8 = 10/8 -1/8 = 9/8
3/10 + 2/5 = 3/10 + 4/10 = 7/10
7/20 -1/4 = 7/20 - 5/20 = 2/20 =1/10
1 - 3/5 = 5/5 - 3/5 = 2/5
2 + 1/3 = 6/3 + 1/3 = 7/3

5/2 -1 = 5/2 -2/2 = 3/2
3 - 7/10 = 30/10 - 7/10 = 23 / 30
2/9 +2 = 2/9 + 18/9 = 20/9
5/2 + 3/3 = 15/6 + 6/6 = 21/6
2/5 - 1/7 = 14/35 - 5/35 = 9/35
2/9 + 3/8 = 16/72 + 27/72 = 43/72
3/2 - 2/5 = 15/10 - 4/10 = 11/10
10/3 + 5/4 = 40/12 + 15/12 = 55/12