Bonjour,
a)
2/5 + 5/5 = 7/5
b)
6/20 = 3/10
c)
2/15 +2/5 = 2/15 + 6/15 = 8/15
d)
3/5 * 5/2 = 15/10 = 3/2
e)
3/2 -10/6 = 9/6 -10/6 = -1/6
2/7 +1/3 = 6/21 + 7/21 = 13/21
-1/6 * 21/13 = -21/78 = -7/26
f)
1/1/3 = 3/3+1/3 = 4/3
3- (5/ 4/3) =
3- 5 / (4/3)
3- 5*3/4 =
3- 15/4 =
12/4 -15/4 = -3/4
