Bonjour,
1)7,3/7+2,7/7 = 10/7
2)8,1/22-2,1/22 = 6/22 = (2 x 3) / (2 x 11) = 3/11
3)12/4+6/4 = 18/4 = (2 x 9) / (2 x 2) = 9/2
4)19,4/8-12,5/8 = 6,9/8 = (6,9 x 10) / (8 x 10) = 69/80
5)8/3+7/3 = 15/3 = (3 x 5) / (3 x 1) = 5
7)7,3/55-1,6/55 = 5,7/55 = (5,7 x 10) / (55 x 10) = 57/550
8)13/6+7/2 = 13/6 + (7 x 3) / (2 x 3) = 13/6 + 21/6 = 34/6 = (2 x 17) / (2 x 3) = 17/3
9)3+2/6 = (3 x 6) / (1 x 6) + 2/6 = 18/6 + 2/6 = 20/6 = (2 x 10) / (2 x 3) = 10/3
10)13/20-2/5 = 13/20 - (2 x 4) / (5 x 4) = 13/20 - 8/20 = 5/20 = (5 x 1) / (5 x 4) = 1/4.
